Fair Value FV Realized and Unrealized Gains and Losses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total realized and unrealized gains (losses) included in net income	$ 298	$ 266	$ 1,133	$ 549
Net unrealized gains related to Level 3 assets and liabilities still held at period end	69	97	397	331
Interest Income [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total realized and unrealized gains (losses) included in net income	79	62	219	187
Net unrealized gains related to Level 3 assets and liabilities still held at period end	0	0	0	0
Fair Value Gains, net [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total realized and unrealized gains (losses) included in net income	185	181	620	342
Net unrealized gains related to Level 3 assets and liabilities still held at period end	69	97	397	331
Net Other-than-Temporary Impairments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total realized and unrealized gains (losses) included in net income	(5)	(11)	(69)	(20)
Net unrealized gains related to Level 3 assets and liabilities still held at period end	0	0	0	0
Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total realized and unrealized gains (losses) included in net income	39	34	363	40
Net unrealized gains related to Level 3 assets and liabilities still held at period end	$ 0	$ 0	$ 0	$ 0