Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 22,703	$ 19,994	$ 22,748	$ 19,534
Other comprehensive income/(loss)	(84)	10	(109)	18
Ending balance	22,861	21,116	22,861	21,116
Accumulated other comprehensive loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(221)	(184)	(196)	(192)
Other comprehensive income/(loss)	(85)	11	(110)	19
Income tax benefit/(expense)	1	(1)	1	(1)
Other comprehensive income/(loss)	(84)	10	(109)	18
Ending balance	(305)	(174)	(305)	(174)
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(175)	(127)	(150)	(134)
Other comprehensive income/(loss)	(85)	11	(110)	17
Income tax benefit/(expense)	1	(1)	1	0
Other comprehensive income/(loss)	(84)	10	(109)	17
Ending balance	(259)	(117)	(259)	(117)
Comprehensive income from equity method investment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	2	2	2	1
Other comprehensive income/(loss)	0	0	0	2
Income tax benefit/(expense)	0	0	0	(1)
Other comprehensive income/(loss)	0	0	0	1
Ending balance	2	2	2	2
Employee benefit plans adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(48)	(59)	(48)	(59)
Other comprehensive income/(loss)	0	0	0	0
Income tax benefit/(expense)	0	0	0	0
Other comprehensive income/(loss)	0	0	0	0
Ending balance	$ (48)	$ (59)	$ (48)	$ (59)