Equity Activity in OCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Equity [Abstract]
Net income	$ 4,640	$ 3,667	$ 6,528	$ 8,992
Other comprehensive (loss) income, net of tax effect:
Changes in net unrealized gains on AFS securities (net of tax of $44 and $119, respectively for the three months ended and net of tax of $31 and $303, respectively, for the six months ended)	(81)	221	(57)	561
Reclassification adjustment for OTTI recognized in net income (net of tax of $4 and $8, respectively, for the three months ended and net of tax of $64 and $26, respectively, for the six months ended)	8	15	118	48
Reclassification adjustment for gains on AFS securities included in net income (net of tax of $112 and $104, respectively, for the three months ended and net of tax of $233 and $104, respectively, for the six months ended)	(207)	(191)	(432)	(192)
Other	(1)	0	(2)	0
Total other comprehensive (loss) income	(281)	45	(373)	417
Total comprehensive income	4,359	3,712	6,155	9,409
Other Comprehensive (Income) Loss Parenthetical Disclosures [Abstract]
Changes in net unrealized gains on AFS securities, tax	44	119	31	303
Reclassification adjustment for OTTI recognized in net income, tax	4	8	64	26
Reclassification adjustment for gains on AFS securities included in net income, tax	$ 112	$ 104	$ 233	$ 104