Derivative Financial Instruments (Details 4) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Settlement Payments By Hedge Classification And Income Statement Location
Total	$ 122	$ 236	$ 193	$ 377
Qualifying Hedges [Member]
Settlement Payments By Hedge Classification And Income Statement Location
Net investment income (loss)	20	18	42	41
Interest credited to policyholder account balances	57	52	118	113
Other expenses	0	(2)	(1)	(4)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member]
Settlement Payments By Hedge Classification And Income Statement Location
Net investment income (loss)	(3)	(2)	(4)	(2)
Other revenues	18	27	33	56
Net derivatives gains (losses)	32	143	5	173
Policyholder benefits and claims	$ (2)	$ 0	$ 0	$ 0