Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss)	$ (1,027)	$ (368)	$ (3,068)	$ (2,791)
Increase (decrease)	(318)	2,223	(474)
Income tax impact	(104)	82	34
Other comprehensive income (loss) before reclassifications, net of income taxes	(422)	2,305	(440)
Reclassification from AOCI	(222)	407	172
Income tax impact	(15)	(12)	(9)
Reclassification adjustments, net of income taxes	(237)	395	163
Other comprehensive income (loss)	(659)	2,700	(277)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss)	(539)	745	(2,174)	(2,100)
Increase (decrease)	(1,277)	2,894	(176)
Income tax impact	(7)	25	(7)
Other comprehensive income (loss) before reclassifications, net of income taxes	(1,284)	2,919	(183)
Reclassification from AOCI	0	0	109
Income tax impact	0	0	0
Reclassification adjustments, net of income taxes	0	0	109
Other comprehensive income (loss)	(1,284)	2,919	(74)
Pension and postretirement plan benefit adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss)	(550)	(928)	(781)	(691)
Increase (decrease)	436	(239)	(149)
Income tax impact	(102)	57	32
Other comprehensive income (loss) before reclassifications, net of income taxes	334	(182)	(117)
Reclassification from AOCI	58	46	36
Income tax impact	(14)	(11)	(9)
Reclassification adjustments, net of income taxes	44	35	27
Other comprehensive income (loss)	378	(147)	(90)
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss)	62	(185)	(113)	$ 0
Increase (decrease)	523	(432)	(149)
Income tax impact	5	0	9
Other comprehensive income (loss) before reclassifications, net of income taxes	528	(432)	(140)
Reclassification from AOCI	(280)	361	27
Income tax impact	(1)	(1)	0
Reclassification adjustments, net of income taxes	(281)	360	27
Other comprehensive income (loss)	$ 247	$ (72)	$ (113)