Shareholders' Equity - Schedule of Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Net unrealized gains on cash flow hedges	$ 159	$ 229
Net unrealized gains (losses) on available-for-sale securities portfolio	(21)	(225)
Net unrealized gains (losses) related to reclassified available-for-sale securities	21	25
Net unrealized gains (losses) on available-for-sale securities	0	(200)
Net unrealized losses on available-for-sale securities designated in fair value hedges	(79)	(86)
Net unrealized gains (losses) on hedges of net investments in non-U.S. subsidiaries	81	95
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit	(8)	(9)
Net unrealized losses on retirement plans	(188)	(194)
Foreign currency translation	(1,770)	(1,875)
Total	$ (1,805)	$ (2,040)