Accumulated Other Comprehensive Loss - Schedule of the Entity's Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			$ 10,437
Other comprehensive income (loss) before reclassifications			3	$ (245)
Amounts reclassified from accumulated other comprehensive loss			39	201
Other comprehensive (loss) income	$ (4)	$ 15	42	(44)
Balance at end of period	2,219	12,577	2,219	12,577
Foreign Currency Translation Adjustment and Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			(422)	(400)
Other comprehensive income (loss) before reclassifications			3	(245)
Amounts reclassified from accumulated other comprehensive loss			0	112
Other comprehensive (loss) income			3	(133)
Balance at end of period	(419)	(533)	(419)	(533)
Interest Rate Swap
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period				(17)
Other comprehensive income (loss) before reclassifications				0
Amounts reclassified from accumulated other comprehensive loss				17
Other comprehensive (loss) income				17
Balance at end of period		0		0
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(1,053)	(2,217)	(1,099)	(2,158)
Other comprehensive (loss) income	(4)	15	42	(44)
Balance at end of period	(1,057)	(2,202)	(1,057)	(2,202)
Pension Plans | Defined Benefit Plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			(985)	(1,577)
Other comprehensive income (loss) before reclassifications			0	0
Amounts reclassified from accumulated other comprehensive loss			55	68
Other comprehensive (loss) income			55	68
Balance at end of period	(930)	(1,509)	(930)	(1,509)
Post-Retirement Benefit Plans | Defined Benefit Plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			308	(164)
Other comprehensive income (loss) before reclassifications			0	0
Amounts reclassified from accumulated other comprehensive loss			(16)	4
Other comprehensive (loss) income			(16)	4
Balance at end of period	$ 292	$ (160)	$ 292	$ (160)