Investment Holding Level 4 Investment Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net Investment Income [Line Items]
Net Investment Income	$ 1,373	$ 1,456	$ 1,543
Investment Income, Investment Expense	52	59	72
Fixed Maturities [Member]
Net Investment Income [Line Items]
Net Investment Income	1,049	1,095	1,113
Equity Securities [Member]
Net Investment Income [Line Items]
Net Investment Income	8	7	14
Mortgages [Member]
Net Investment Income [Line Items]
Net Investment Income	135	152	156
Policy Loans [Member]
Net Investment Income [Line Items]
Net Investment Income	83	82	80
Limited Partnerships and Other Alternative Investments [Member]
Net Investment Income [Line Items]
Net Investment Income	86	97	141
Other Investments [Member]
Net Investment Income [Line Items]
Net Investment Income	64	82	111
Available-for-sale Securities [Member]
Net Investment Income [Line Items]
Net Investment Income	$ 1,373	$ 1,456	$ 1,543