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Stockholders' equity (Components of AOCI) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	$ 25,241
Foreign currency translation adjustments	29	$ 24
Balance as of end of period	15,620
Foreign currency translation [Member]
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	(529)
Foreign currency translation adjustments	29
Balance as of end of period	(500)
Cash flow hedges [Member]
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	(6)
Unrealized gains (losses)	149
Reclassification adjustments to income	(130)
Income taxes	(13)
Balance as of end of period	0
Available-for-sale securities [Member]
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	(144)
Cumulative effect of change in accounting principle, net of tax			$ (9)
Unrealized gains (losses)	(482)
Reclassification adjustments to income	134
Income taxes	5
Balance as of end of period	(496)
Other [Member]
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	0
Unrealized gains (losses)	0
Other	2
Balance as of end of period	2
AOCI [Member]
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	(679)
Cumulative effect of change in accounting principle, net of tax			$ (9)
Foreign currency translation adjustments	29
Unrealized gains (losses)	(333)
Reclassification adjustments to income	4
Other	2
Income taxes	(8)
Balance as of end of period	$ (994)

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Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent.

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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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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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