Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 13,009
Other comprehensive loss, net of tax	(115)	$ (8)
Net other comprehensive loss	(115)	(8)
Balance at end of period	12,552	13,170
Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	3	(13)
Other comprehensive loss, net of tax	0	0
Net other comprehensive loss	0	0
Balance at end of period	3	(13)
Foreign Currency Translation Adjustment and Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(354)	(221)
Other comprehensive loss, net of tax	(115)	(8)
Net other comprehensive loss	(115)	(8)
Balance at end of period	(469)	(229)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(351)	(234)
Balance at end of period	$ (466)	$ (242)