Fair Value FV Realized and Unrealized Gains and Losses (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
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total realized and unrealized gains (losses) included in net income	$ 703	$ 38	$ 835	$ 283
Net unrealized gains related to Level 3 assets and liabilities still held at period end	417	3	531	135
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	70	70	140	125
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	329	(31)	435	161
Net unrealized gains related to Level 3 assets and liabilities still held at period end	417	3	531	135
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	(19)	(4)	(64)	(9)
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	323	3	324	6
Net unrealized gains related to Level 3 assets and liabilities still held at period end	$ 0	$ 0	$ 0	$ 0