Pro Forma Net Income per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) $ / shares	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) $ / shares	Jun. 16, 2024	Jun. 15, 2024 shares
Numerator:
Net income attributable to Liberty Sirius XM Holdings Inc. \| $	$ 304	$ 188	$ 503	$ 381
Denominator:
Common stock outstanding (in shares)	335		335
Net income per common share:
Unaudited pro forma net income attributable to Liberty Sirius XM Holdings Inc. per share - basic (in USD per share) \| $ / shares	$ 0.91		$ 1.50
Liberty Sirius XM
Denominator:
Common stock outstanding (in shares)	271		271			327
Redemption ratio	0.83		0.83		0.83
Sirius XM Holdings, Inc.
Denominator:
Common stock outstanding (in shares)	64		64			645
Redemption ratio	0.1		0.1		0.1

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

Liberty Sirius XM Holdings Inc. 10-Q