Commitments and Contingencies Level 4 (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Minimum Percentage of Premiums Written Per Year to be Considered for Assessment Under Guaranty Fund	$ 0.01
Maximum Percentage of Premiums Written Per Year to be Considered for Assessment Under Guaranty Fund	0.02
Leases [Abstract]
Operating Leases, Rent Expense	2,000,000	$ 9,000,000	$ 7,000,000
Unfunded Commitments [Abstract]
Unfunded Commitments	645,000,000
Commitments to Fund Limited Partnership and Other Alternative Investments	497,000,000
Commitment to fund Private placement securities	106,000,000
Commitments to Fund Mortgage Loans	42,000,000
Guaranty Fund [Abstract]
Loss Contingency, Discounted Amount of Insurance-related Assessment Liability	15,000,000
Loss Contingency Accrual, Insurance-related Assessment, Premium Tax Offset	15,000,000	27,000,000
Derivative Liability [Abstract]
Derivative, Net Liability Position, Aggregate Fair Value	794,000,000
Collateral Already Posted, Aggregate Fair Value	939,000,000
Guaranty Liabilities	8,000,000	$ 15,000,000
GMWB Product Derivatives [Member]
Derivative Liability [Abstract]
Collateral Already Posted, Aggregate Fair Value	$ 31,000,000