Fair Value FV Realized and Unrealized Gains and Losses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total realized and unrealized gains (losses) included in net income	$ 132	$ 245
Net unrealized gains related to Level 3 assets and liabilities still held	115	202
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	55
Net unrealized gains related to Level 3 assets and liabilities still held	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	106	192
Net unrealized gains related to Level 3 assets and liabilities still held	115	202
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	(45)	(5)
Net unrealized gains related to Level 3 assets and liabilities still held	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	1	3
Net unrealized gains related to Level 3 assets and liabilities still held	$ 0	$ 0