Investments (Components of Net Investment Gains 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
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	$ (48)	$ (40)	$ (59)	$ (121)
Fixed maturity securities - net gains (losses) on sales and disposals	69	179	165	548
Equity securities - net gains (losses) on sales and disposals	58	5	84	(1)
Net investment gains (losses)	79	144	190	426
Other net investment gains (losses):
Trading and other securities FVO general account securities - changes in estimated fair value	(1)	4	8	8
Mortgage Loans	16	23	5	35
Real estate and real estate joint ventures	(1)	(9)	64	(23)
Other limited partnership interests	(36)	(41)	(38)	(41)
Other investment portfolio gains (losses)	(2)	27	(6)	34
Subtotal - investment portfolio gains (losses)	55	148	223	439
FVO CSEs - changes in estimated fair value subsequent to consolidation:
Commercial mortgage loans	(16)	(19)	(15)	(32)
Long-term debt - related to commercial mortgage loans	17	26	18	48
Long-term debt - related to trading securities	0	1	0	0
Non-investment portfolio gains (losses)	(181)	(46)	(762)	(31)
Subtotal FVO CSEs and non-investment portfolio gains (losses)	(180)	(38)	(759)	(15)
Total net investment gains (losses)	(125)	110	(536)	424
Fixed maturity securities [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	(15)	(39)	(25)	(99)
Net investment gains (losses)	54	140	140	449
Utility Domestic Corporate Debt Securities [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	0	(27)	0	(32)
Consumer Domestic Corporate Debt Securities [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	0	0	(7)	(8)
Finance Domestic Corporate Debt Securities [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	0	0	0	(10)
Transportation Domestic Corporate Debt Securities [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	(2)	0	(2)	0
Communications Domestic Corporate Debt Securities [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	0	(2)	0	(2)
Corporate fixed maturity securities [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	(2)	(29)	(9)	(52)
RMBS [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	(6)	(10)	(9)	(47)
ABS [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	(7)	0	(7)	0
Equity Securities [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	(33)	(1)	(34)	(22)
Net investment gains (losses)	25	4	50	(23)
Non-redeemable preferred stock [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	(23)	0	(23)	(20)
Common Stock [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	$ (10)	$ (1)	$ (11)	$ (2)