Equity Activity in OCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Equity [Abstract]
Net income	$ 1,960	$ 3,905	$ 8,488	$ 12,897
Other comprehensive (loss) income, net of tax effect:
Changes in net unrealized gains on AFS securities (net of tax of $58 and $61, respectively for the three months ended and net of tax of $89 and $364, respectively, for the nine months ended)	(107)	113	(164)	675
Reclassification adjustment for OTTI recognized in net income (net of tax of $2, for the three months ended and net of tax of $66 and $28, respectively, for the nine months ended)	3	4	121	52
Reclassification adjustment for gains on AFS securities included in net income (net of tax of $32 and $29, respectively, for the three months ended and net of tax of $265 and $133, respectively, for the nine months ended)	(73)	(54)	(505)	(247)
Other	430	32	428	32
Total other comprehensive income (loss)	253	95	(120)	512
Total comprehensive income	2,213	4,000	8,368	13,409
Other Comprehensive (Income) Loss Parenthetical Disclosures [Abstract]
Changes in net unrealized gains on AFS securities, tax	58	61	89	364
Reclassification adjustment for OTTI recognized in net income, tax	2	2	66	28
Reclassification adjustment for gains on AFS securities included in net income, tax	$ 32	$ 29	$ 265	$ 133