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Stockholders' equity (Accumulated Other Comprehensive Income (Loss), Textual) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Income tax expense or (benefit) for reclassification adjustments to income for available-for-sale securities	$ 3	$ (8)	$ 11
Income taxes expense or (benefit) for unrealized gains and losses for available-for-sale securities	(9)	9	(9)
Income taxes expense or (benefit) for unrealized gains and losses for cash flow hedges	21	68	(68)
Income tax expense or (benefit) reclassification adjustments to income for cash flow hedges	$ 55	$ (226)	$ 46

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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