Investments and Derivative Instruments Level 4 Repurchase Agreements, Dollar Roll Transactions and Other Collateral Transactions (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Assets Sold under Agreements to Repurchase [Line Items]
Securities Loaned	$ 69	$ 15
Security Owned and Pledged as Collateral, Associated Liabilities, Fair Value	70	15
Secured Debt, Dollar Rolls	0	0
Fixed Maturities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Available-for-sale Securities Pledged as Collateral	233,000,000	249,000,000
Other Liabilities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability	231,000,000	249,000,000
US Treasury Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Available-for-sale Securities Pledged as Collateral	$ 23,000,000	$ 14,000,000