Closed Block (Revenues and Expenses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues
Premiums	$ 464	$ 498
Net investment income	533	550
Net investment gains (losses)	3	11
Net derivative gains (losses)	8	(9)
Total revenues	1,008	1,050
Expenses
Policyholder benefits and claims	643	662
Policyholder dividends	242	268
Other expenses	42	45
Total expenses	927	975
Revenues, net of expenses before provision for income tax expense (benefit)	81	75
Provision for income tax expense (benefit)	27	27
Revenues, net of expenses and provision for income tax expense (benefit) from continuing operations	54	48
Revenues, net of expenses and provision for income tax expense (benefit) from discontinued operations	0	4
Revenues, net of expenses and provision for income tax expense (benefit)	$ 54	$ 52