Closed Block (Revenues and Expenses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues
Premiums	$ 489	$ 528	$ 953	$ 1,026
Net investment income	529	539	1,062	1,089
Net investment gains (losses)	24	13	27	24
Net derivative gains (losses)	7	11	15	2
Total revenues	1,049	1,091	2,057	2,141
Expenses
Policyholder benefits and claims	669	700	1,312	1,362
Policyholder dividends	247	275	489	543
Other expenses	43	46	85	91
Total expenses	959	1,021	1,886	1,996
Revenues, net of expenses before provision for income tax expense (benefit)	90	70	171	145
Provision for income tax expense (benefit)	33	25	60	52
Revenues, net of expenses and provision for income tax expense (benefit) from continuing operations	57	45	111	93
Revenues, net of expenses and provision for income tax expense (benefit) from discontinued operations	0	0	0	4
Revenues, net of expenses and provision for income tax expense (benefit)	$ 57	$ 45	$ 111	$ 97