Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2024 USD ($) location $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of locations (more than) \| location	10,700
Provisions for doubtful accounts	$ 30,001,000	$ 25,947,000	$ 19,791,000
Allowance for doubtful accounts receivable	69,000,000	57,000,000
Excess of FIFO costs over stated LIFO value	$ 896,000,000	880,000,000
Reduction in cost of goods sold by the effect of LIFO liquidations			0
Impairment Of Intangible Asset Finite Lived Statement Of Income Or Comprehensive Income Extensible Enumeration, Not Disclosed Flag	earnings
Impairment of intangible assets	$ 0	0	17,000,000
Strategic investment planning term	20 years
Selling, administrative and other expenses	$ 6,642,900,000	6,167,143,000	5,758,295,000
Advertising costs	$ 237,000,000	$ 234,000,000	$ 236,000,000
Number of common shares issued for each RSU exercised (in shares) \| shares	1
Outstanding options to purchase common shares not included in dilutive share (in shares) \| shares	11,000	3,000	4,000
Exercise price range, lower range limit (in dollars per share) \| $ / shares	$ 72	$ 72	$ 72
Exercise price range, upper range limit (in dollars per share) \| $ / shares	$ 179	$ 179	$ 179
Stockholders' equity	$ 4,351,851,000	$ 4,416,985,000	$ 3,804,447,000	$ 3,503,290,000
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity	5,263,838,000	5,065,327,000	4,541,640,000	$ 4,086,325,000
Level 2
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt instrument, fair value disclosure	4,100,000,000	3,700,000,000
Shipping and Handling
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Selling, administrative and other expenses	$ 381,000,000	$ 451,000,000	$ 407,000,000
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Share-based payment awards granted vesting period range (in years)	1 year
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Share-based payment awards granted vesting period range (in years)	3 years
Building and Building Improvements \| Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property plant and equipment useful life (in years)	10 years
Building and Building Improvements \| Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property plant and equipment useful life (in years)	40 years
Machinery and Equipment \| Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property plant and equipment useful life (in years)	5 years
Machinery and Equipment \| Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property plant and equipment useful life (in years)	15 years
Furniture and fixtures \| Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property plant and equipment useful life (in years)	5 years
Furniture and fixtures \| Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property plant and equipment useful life (in years)	15 years
Software Development \| Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property plant and equipment useful life (in years)	3 years
Software Development \| Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property plant and equipment useful life (in years)	5 years

GENUINE PARTS CO 10-K