Investments (Components of Net Investment Gains 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
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	$ (32)	$ (34)	$ (91)	$ (155)
Fixed maturity securities - net gains (losses) on sales and disposals	184	(44)	349	504
Equity securities - net gains (losses) on sales and disposals	15	3	99	2
Net investment gains (losses)	167	(75)	357	351
Other net investment gains (losses):
Trading and other securities FVO general account securities - changes in estimated fair value	0	1	8	9
Mortgage Loans	(30)	(13)	(25)	22
Real estate and real estate joint ventures	86	4	150	(19)
Other limited partnership interests	(14)	0	(52)	(41)
Other investment portfolio gains (losses)	(20)	12	(26)	46
Subtotal - investment portfolio gains (losses)	189	(71)	412	368
FVO CSEs - changes in estimated fair value subsequent to consolidation:
Commercial mortgage loans	1	(14)	(14)	(46)
Securities	0	1	0	1
Long-term debt - related to commercial mortgage loans	3	18	21	66
Long-term debt - related to trading securities	(1)	(1)	(1)	(1)
Non-investment portfolio gains (losses)	(83)	(18)	(845)	(49)
Subtotal FVO CSEs and non-investment portfolio gains (losses)	(80)	(14)	(839)	(29)
Total net investment gains (losses)	109	(85)	(427)	339
Fixed maturity securities [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	(31)	(34)	(56)	(133)
Net investment gains (losses)	153	(78)	293	371
Utility Domestic Corporate Debt Securities [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	0	(1)	0	(33)
Consumer Domestic Corporate Debt Securities [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	0	(3)	(7)	(11)
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	0	(3)	(2)	(3)
Communications Domestic Corporate Debt Securities [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	0	0	0	(2)
Corporate fixed maturity securities [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	0	(7)	(9)	(59)
RMBS [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	(18)	(27)	(27)	(74)
ABS [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	0	0	(7)	0
CMBS [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	(13)	0	(13)	0
Equity Securities [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	(1)	0	(35)	(22)
Net investment gains (losses)	14	3	64	(20)
Non-redeemable preferred stock [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	0	0	(23)	(20)
Common Stock [Member]
Marketable Securities, Gain (Loss) [Abstract]
Total OTTI losses recognized in earnings	$ (1)	$ 0	$ (12)	$ (2)