Investments (Sales or Disposals and Impairments of Fixed Maturity and Equity Securities) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Components of Sales or Disposals of Fixed Maturity and Equity Securities
Proceeds	$ 22,392	$ 19,636
Gross investment gains	341	508
Gross investment losses	(219)	(145)
Total OTTI losses recognized in earnings:
Total OTTI losses recognized in earnings	(11)	(81)
Net investment gains (losses)	111	282
Credit-related [Member]
Total OTTI losses recognized in earnings:
Total OTTI losses recognized in earnings	(10)	(42)
Other [Member]
Total OTTI losses recognized in earnings:
Total OTTI losses recognized in earnings	(1)	(39)
Fixed maturity securities [Member]
Components of Sales or Disposals of Fixed Maturity and Equity Securities
Proceeds	22,291	19,550
Gross investment gains	314	500
Gross investment losses	(218)	(131)
Total OTTI losses recognized in earnings:
Total OTTI losses recognized in earnings	(10)	(60)
Net investment gains (losses)	86	309
Fixed maturity securities [Member] | Credit-related [Member]
Total OTTI losses recognized in earnings:
Total OTTI losses recognized in earnings	(10)	(42)
Fixed maturity securities [Member] | Other [Member]
Total OTTI losses recognized in earnings:
Total OTTI losses recognized in earnings	0	(18)
Equity Securities [Member]
Components of Sales or Disposals of Fixed Maturity and Equity Securities
Proceeds	101	86
Gross investment gains	27	8
Gross investment losses	(1)	(14)
Total OTTI losses recognized in earnings:
Total OTTI losses recognized in earnings	(1)	(21)
Net investment gains (losses)	25	(27)
Equity Securities [Member] | Credit-related [Member]
Total OTTI losses recognized in earnings:
Total OTTI losses recognized in earnings	0	0
Equity Securities [Member] | Other [Member]
Total OTTI losses recognized in earnings:
Total OTTI losses recognized in earnings	$ (1)	$ (21)