Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax
Beginning balance	$ 13,097	$ (8,172)	$ (8,446)
Other comprehensive income (loss)	218	479	(1,116)
Ending balance	15,436	13,097	(8,172)
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax
Beginning balance	(3,117)	(3,596)	(2,480)
Other comprehensive income (loss)	218	479	(1,116)
Ending balance	(2,899)	(3,117)	(3,596)
Foreign currency translation adjustments
AOCI Attributable to Parent, Net of Tax
Beginning balance	583	(928)	(830)
Other comprehensive income (loss) before reclassifications	(1,153)	1,511	(98)
Net losses (gains) reclassified from accumulated other comprehensive loss	0	0	0
Other comprehensive income (loss)	(1,153)	1,511	(98)
Ending balance	(570)	583	(928)
Net investment hedging activities
AOCI Attributable to Parent, Net of Tax
Beginning balance	(790)	9	(65)
Other comprehensive income (loss) before reclassifications	720	(785)	95
Net losses (gains) reclassified from accumulated other comprehensive loss	(21)	(14)	(21)
Other comprehensive income (loss)	699	(799)	74
Ending balance	(91)	(790)	9
Pension and post-employment benefits
AOCI Attributable to Parent, Net of Tax
Beginning balance	(3,067)	(2,965)	(1,722)
Other comprehensive income (loss) before reclassifications	298	(300)	(1,330)
Net losses (gains) reclassified from accumulated other comprehensive loss	223	198	87
Other comprehensive income (loss)	521	(102)	(1,243)
Ending balance	(2,546)	(3,067)	(2,965)
Marketable security activities
AOCI Attributable to Parent, Net of Tax
Beginning balance	0	0	(10)
Other comprehensive income (loss) before reclassifications	0	0	12
Net losses (gains) reclassified from accumulated other comprehensive loss	0	0	(2)
Other comprehensive income (loss)	0	0	10
Ending balance	0	0	0
Cash flow hedging activities
AOCI Attributable to Parent, Net of Tax
Beginning balance	157	288	147
Other comprehensive income (loss) before reclassifications	76	(108)	298
Net losses (gains) reclassified from accumulated other comprehensive loss	75	(23)	(157)
Other comprehensive income (loss)	151	(131)	141
Ending balance	308	157	288
Accumulated other comprehensive income (loss)
AOCI Attributable to Parent, Net of Tax
Beginning balance	(3,117)	(3,596)	(2,480)
Other comprehensive income (loss) before reclassifications	(59)	318	(1,023)
Net losses (gains) reclassified from accumulated other comprehensive loss	277	161	(93)
Other comprehensive income (loss)	218	479	(1,116)
Ending balance	$ (2,899)	$ (3,117)	$ (3,596)