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Fair Value Measurements (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Proceeds from the sale of investments in available-for-sale securities, realized gains and losses on those sales, and interest and dividend income
Sales Proceeds	$ 638	$ 131	$ 1,177	$ 382
Realized Gains	16	17	40	37
Realized Losses	(11)	(15)	(16)	(28)
OTTI	(46)	(3)	(53)	(7)
Interest and Dividend Income	22	18	48	33
FES
Proceeds from the sale of investments in available-for-sale securities, realized gains and losses on those sales, and interest and dividend income
Sales Proceeds	235	25	487	109
Realized Gains	13	13	33	26
Realized Losses	(8)	(11)	(11)	(19)
OTTI	(38)	(3)	(45)	(6)
Interest and Dividend Income	$ 15	$ 11	$ 28	$ 18

The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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