Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 22,761	$ 22,748
Other comprehensive income/(loss)	16	(25)
Ending balance	23,211	22,703
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(331)	(196)
Other comprehensive income (loss)	16	(25)
Income tax benefit/(expense)	0	0
Other comprehensive income/(loss)	16	(25)
Ending balance	(315)	(221)
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(278)	(150)
Other comprehensive income (loss)	16	(25)
Income tax benefit/(expense)	0	0
Other comprehensive income/(loss)	16	(25)
Ending balance	(262)	(175)
Comprehensive income from equity method investment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	2	2
Other comprehensive income (loss)	0	0
Income tax benefit/(expense)	0	0
Other comprehensive income/(loss)	0	0
Ending balance	2	2
Employee benefit plans adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(55)	(48)
Other comprehensive income (loss)	0	0
Income tax benefit/(expense)	0	0
Other comprehensive income/(loss)	0	0
Ending balance	$ (55)	$ (48)