Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 1,859	$ 2,021	$ 6,466	$ 6,243
Other comprehensive income (loss), net of reclassification adjustments and taxes:
(Losses) gains on foreign currency translation	(71)	41	(153)	100
Gains (losses) on cash flow hedges	41	(50)	270	(324)
Gains (losses) on available-for-sale securities	97	9	(237)	247
Other	(3)	6	(1)	5
Other comprehensive income (loss), net of taxes	64	6	(121)	28
Comprehensive income	$ 1,923	$ 2,027	$ 6,345	$ 6,271

Other Comprehensive Income (Loss), Other Gains (Losses), Net of Tax, Portion Attributable to Parent

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

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Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness, attributable to parent.

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