Equity Activity in OCI (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013		Jun. 30, 2014	Jun. 30, 2013
Equity [Abstract]
Net income	$ 3,667	$ 10,095	[1]	$ 8,992	$ 68,780	[1]
Other comprehensive income, net of tax effect:
Changes in net unrealized gains on AFS securities (net of tax of $119 and $47, respectively, for the three months ended and net of tax of $303 and $396, respectively, for the six months ended)	221	88		561	735
Reclassification adjustment for OTTI recognized in net income (net of tax of $8 and $2, respectively, for the three months ended and net of tax of $26 and $5, respectively, for the six months ended)	15	4		48	10
Reclassification adjustment for gains on AFS securities included in net income (net of tax of $104 and $40, respectively, for the three months ended and net of tax of $104 and $43, respectively, for the six months ended)	(191)	(75)		(192)	(80)
Other	0	149		0	155
Total other comprehensive income	45	166		417	820
Total comprehensive income	3,712	10,261		9,409	69,600
Other Comprehensive (Income) Loss Parenthetical Disclosures [Abstract]
Changes in net unrealized gains on AFS securities, tax	119	47		303	396
Reclassification adjustment for OTTI recognized in net income, tax	8	2		26	5
Reclassification adjustment for gains on AFS securities included in net income, tax	$ 104	$ 40		$ 104	$ 43

[1] Certain prior period amounts have been reclassified to conform with the current period presentation.