Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 13,009
Other comprehensive income, net of tax	69	$ (88)
Net other comprehensive income	69	(88)
Balance at end of period	12,982	12,968
Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	3	(13)
Other comprehensive income, net of tax	0	0
Net other comprehensive income	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 income, net of tax	69	(88)
Net other comprehensive income	69	(88)
Balance at end of period	(285)	(309)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(351)	(234)
Balance at end of period	$ (282)	$ (322)