Commitments and Contingencies Level 4 (Details) - USD ($)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loss Contingencies [Line Items]
Minimum Percentage of Premiums Written Per Year to be Considered for Assessment Under Guaranty Fund		$ 0.01
Leases [Abstract]
Operating Leases, Rent Expense		60,000,000	$ 62,000,000	$ 79,000,000
Operating Leases, Income Statement, Sublease Revenue		3,000,000	4,000,000	$ 8,000,000
Operating Leases, Future Minimum Payments Due, Next Twelve Months		39,000,000
Operating Leases, Future Minimum Payments, Due in Two Years		33,000,000
Operating Leases, Future Minimum Payments, Due in Three Years		27,000,000
Operating Leases, Future Minimum Payments, Due in Four Years		19,000,000
Operating Leases, Future Minimum Payments, Due in Five Years		12,000,000
Operating Leases, Future Minimum Payments, Due Thereafter		13,000,000
Operating Leases, Future Minimum Payments Due	[1]	143,000,000
Operating Leases, Future Minimum Payments Receivable, Current		3,000,000
Operating Leases, Future Minimum Payments Receivable, in Two Years		2,000,000
Operating Leases, Future Minimum Payments Receivable, in Three Years		2,000,000
Operating Leases, Future Minimum Payments Receivable, in Four Years		2,000,000
Operating Leases, Future Minimum Payments Receivable, in Five Years		2,000,000
Operating Leases, Future Minimum Payments Receivable, Thereafter		0
Unfunded Commitments [Abstract]
Unfunded Commitments		1,000,000,000
Commitments to Fund Limited Partnership and Other Alternative Investments		748,000,000
Commitment to fund Private placement securities		236,000,000
Commitments to Fund Mortgage Loans		31,000,000
Derivative Liability [Abstract]
Derivative, Net Liability Position, Aggregate Fair Value		1,300,000,000
Collateral Already Posted, Aggregate Fair Value		1,500,000,000
Maximum Percentage of Premiums Written Per Year to be Considered for Assessment Under Guaranty Fund		0.02
Guaranty Liabilities		138,000,000	131,000,000
Net Asbestos Reserves [Member]
Loss Contingencies [Line Items]
Liability for Asbestos and Environmental Claims, Net		1,700,000,000
Net Environmental Reserves [Member]
Loss Contingencies [Line Items]
Liability for Asbestos and Environmental Claims, Net		256,000,000	247,000,000
GMWB Product Derivatives [Member]
Derivative Liability [Abstract]
Collateral Already Posted, Aggregate Fair Value		34,000,000
Other Assets [Member]
Derivative Liability [Abstract]
Loss Contingency Accrual, Insurance-related Assessment, Premium Tax Offset		$ 44,000,000	$ 42,000,000

[1] Excludes expected future minimum sublease income of approximately $3, $2, $2, $2, $2 and $0 in 2016, 2017, 2018, 2019, 2020 and thereafter respectively.