Stockholders' equity (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance, Foreign currency translation	$ 12	$ 21	$ 22
Beginning balance, Cash flow hedges	(35)	43	3
Beginning balance, Available-for-sale securities	183	120	135
Beginning balance, Other	(14)	(13)	(7)
Beginning balance, AOCI	146	171	153
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments	(71)	(13)	(6)
Unrealized gains (losses), Cash flow hedges	88	15	(51)
Unrealized gains (losses), Available-for-sale securities	(284)	233	125
Unrealized gains (losses), Other	(1)	(1)	2
Unrealized gains (losses), AOCI	(197)	247	76
Reclassification adjustments to income, Cash flow hedges	(85)	134	112
Reclassification adjustments to income, Available-for-sale securities	(75)	132	(154)
Reclassification adjustments to income, AOCI	(160)	266	(42)
Other	(2)		(8)
Other, AOCI	(2)		(8)
Income taxes, Foreign currency translation	(9)	4	5
Income taxes, Cash flow hedges	(1)	41	(21)
Income taxes, Available-for-sale securities	133	(38)	14
Income taxes, Other	0	0	0
Income taxes, AOCI	123	7	(2)
Ending balance, Foreign currency translation	(68)	12	21
Ending balance, Cash flow hedges	(33)	(35)	43
Ending balance, Available-for-sale securities	(43)	183	120
Ending balance, Other	(17)	(14)	(13)
Ending balance, AOCI	$ (161)	$ 146	$ 171

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Other comprehensive income other, before tax.

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Tax effect of other comprehensive income net of reclassification adjustments.

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Unrealized other comprehensive gain (loss) arising during period on other items, before reclassifications and tax.

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Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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