Shareholders' Equity - Schedule of Changes in AOCI (Details) - USD ($) $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended
	Jan. 31, 2022	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 11,614	$ 0	$ 11,372	$ 11,614
Separation-related adjustments	(197)
Other comprehensive (loss) income, net of income taxes		21	(48)	21
Ending balance	0	11,505	11,086	11,505
Losses on Cash Flow Hedges
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(8)		(9)	(8)
Separation-related adjustments				0
OCI before reclassifications			0	0
Amounts reclassified from AOCI			0	0
Other comprehensive (loss) income, net of income taxes			0	0
Ending balance		(8)	(9)	(8)
Pension and Non-Pension Postretirement Benefit Plan Items
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	0		(1,725)	0
Separation-related adjustments				(2,006)
OCI before reclassifications			(53)	0
Amounts reclassified from AOCI			5	17
Other comprehensive (loss) income, net of income taxes			(48)	(1,989)
Ending balance		(1,989)	(1,773)	(1,989)
Foreign Currency Items
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(23)		(26)	(23)
Separation-related adjustments				0
OCI before reclassifications			0	4
Amounts reclassified from AOCI			0	0
Other comprehensive (loss) income, net of income taxes			0	4
Ending balance		(19)	(26)	(19)
Total
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ (31)		(1,760)	(31)
Separation-related adjustments				(2,006)
OCI before reclassifications			(53)	4
Amounts reclassified from AOCI			5	17
Other comprehensive (loss) income, net of income taxes			(48)	(1,985)
Ending balance		$ (2,016)	$ (1,808)	$ (2,016)