Closed Block (Revenues and Expenses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues
Premiums	$ 430	$ 446
Net investment income	515	530
Net investment gains (losses)	(1)	0
Net derivative gains (losses)	25	(1)
Total revenues	969	975
Expenses
Policyholder benefits and claims	608	624
Policyholder dividends	240	233
Other expenses	37	41
Total expenses	885	898
Revenues, net of expenses before provision for income tax expense (benefit)	84	77
Provision for income tax expense (benefit)	29	27
Revenues, net of expenses and provision for income tax expense (benefit)	$ 55	$ 50