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Stockholders' Equity and Noncontrolling Interests - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance at beginning of period	$ 44,638	$ 42,777	$ 35,458	$ 36,200	$ 42,777	$ 36,200
Other comprehensive income (loss), net of tax	74	185	(94)	27	259	(67)
Balance at end of period	47,089	44,638	38,636	35,458	47,089	38,636
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance at beginning of period	(2,125)	(2,250)	(1,498)	(1,606)	(2,250)	(1,606)
Other comprehensive income (loss) and noncontrolling interests, net of reclassification adjustment, tax and impact of adoption of accounting standards	47		(328)		172	(220)
Balance at end of period	(2,078)	(2,125)	(1,826)	(1,498)	(2,078)	(1,826)
Defined benefit plans [Member]
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance at beginning of period	(6,701)	(6,737)	(6,524)	(6,398)	(6,737)	(6,398)
Other comprehensive income (loss) before reclassification adjustment, net of tax and impact of adoption of accounting standards	(28)		190		(29)	20
Reclassification adjustment, net of tax	34		44		71	88
Other comprehensive income (loss), net of tax	6		234		42	108
Balance at end of period	$ (6,695)	$ (6,701)	$ (6,290)	$ (6,524)	$ (6,695)	$ (6,290)

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Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest and Impact of Adoption of Accounting Standards

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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