Accumulated Other Comprehensive Loss - Schedule of the Entity's Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			$ 10,437
Other comprehensive income (loss) before reclassifications			20	$ (125)
Amounts reclassified from accumulated other comprehensive loss			26	66
Other comprehensive income (loss)	$ 16	$ (170)	46	(59)
Balance at end of period	2,284	12,219	2,284	12,219
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			20	(125)
Amounts reclassified from accumulated other comprehensive loss			0	0
Other comprehensive income (loss)			20	(125)
Balance at end of period	(402)	(525)	(402)	(525)
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 income (loss)				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	(1,069)	(2,047)	(1,099)	(2,158)
Other comprehensive income (loss)	16	(170)	46	(59)
Balance at end of period	(1,053)	(2,217)	(1,053)	(2,217)
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			36	46
Other comprehensive income (loss)			36	46
Balance at end of period	(949)	(1,531)	(949)	(1,531)
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			(10)	3
Other comprehensive income (loss)			(10)	3
Balance at end of period	$ 298	$ (161)	$ 298	$ (161)