Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Unrealized gains/(losses) on AFS securities:
Total other comprehensive income, after–tax	$ 436	$ 241
Net losses reclassified from AOCI to other income		150
Unrealized gains/(losses) on investment securities
Unrealized gains/(losses) on AFS securities:
Net unrealized gains/(losses) arising during the period/Translation, Pretax	732	225
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	(275)	(104)
Net unrealized gains/(losses) arising during the period/Translation, After-tax	457	121
Reclassification, Pretax	(51)	(52)
Reclassification, Tax effect	19	20
Reclassification, After-tax	(32)	(32)
Net change, Pretax	681	173
Net change, Tax effect	(256)	(84)
Total other comprehensive income, after–tax	425	89
Translation adjustments
Unrealized gains/(losses) on AFS securities:
Net unrealized gains/(losses) arising during the period/Translation, Pretax	589	(1,000)
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	(220)	378
Net unrealized gains/(losses) arising during the period/Translation, After-tax	369	(622)
Reclassification, Pretax	(590)	993
Reclassification, Tax effect	219	(381)
Reclassification, After-tax	(371)	612
Net change, Pretax	(1)	(7)
Net change, Tax effect	(1)	(3)
Total other comprehensive income, after–tax	(2)	(10)
Cash flow hedges
Unrealized gains/(losses) on AFS securities:
Net unrealized gains/(losses) arising during the period/Translation, Pretax	(167)	(49)
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	63	18
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(104)	(31)
Reclassification, Pretax	55	175
Reclassification, Tax effect	(21)	(67)
Reclassification, After-tax	34	108
Net change, Pretax	(112)	126
Net change, Tax effect	42	(49)
Total other comprehensive income, after–tax	(70)	77
Defined benefit pension and OPEB plans
Unrealized gains/(losses) on AFS securities:
Net change, Pretax	38	155
Net change, Tax effect	(13)	(70)
Total other comprehensive income, after–tax	25	85
Net gain/(losses)/Amortization of net loss
Unrealized gains/(losses) on AFS securities:
Net unrealized gains/(losses) arising during the period/Translation, Pretax	(23)	60
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	9	(24)
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(14)	36
Reclassification, Pretax	64	71
Reclassification, Tax effect	(24)	(27)
Reclassification, After-tax	40	44
Prior service costs/(credits)
Unrealized gains/(losses) on AFS securities:
Reclassification, Pretax	(9)	(9)
Reclassification, Tax effect	4	3
Reclassification, After-tax	(5)	(6)
Foreign exchange and other
Unrealized gains/(losses) on AFS securities:
Reclassification, Pretax	6	33
Reclassification, Tax effect	(2)	(22)
Reclassification, After-tax	4	11
DVA on fair value option elected liabilities, net change
Unrealized gains/(losses) on AFS securities:
Net change, Pretax	92
Net change, Tax effect	(34)
Total other comprehensive income, after–tax	58
Accumulated other comprehensive income/(loss)
Unrealized gains/(losses) on AFS securities:
Net change, Pretax	698	447
Net change, Tax effect	(262)	(206)
Total other comprehensive income, after–tax	$ 436	$ 241

The amount of loss reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period.

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