Commitments and Contingencies Level 4 (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
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	62,000,000		79,000,000	105,000,000
Operating Leases, Income Statement, Sublease Revenue	4,000,000		8,000,000	6,000,000
Operating Leases, Future Minimum Payments Due, Next Twelve Months	42,000,000
Operating Leases, Future Minimum Payments, Due in Two Years	35,000,000
Operating Leases, Future Minimum Payments, Due in Three Years	29,000,000
Operating Leases, Future Minimum Payments, Due in Four Years	22,000,000
Operating Leases, Future Minimum Payments, Due in Five Years	14,000,000
Operating Leases, Future Minimum Payments, Due Thereafter	12,000,000
Operating Leases, Future Minimum Payments Due	154,000,000	[1]
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	3,000,000
Unfunded Commitments [Abstract]
Unfunded Commitments	865,000,000
Commitments to Fund Limited Partnership and Other Alternative Investments	604,000,000
Commitments to Fund Mortgage Loans	246,000,000
Derivative Liability [Abstract]
Derivative, Net Liability Position, Aggregate Fair Value	1,000,000,000
Collateral Already Posted, Aggregate Fair Value	1,300,000,000
Maximum Percentage of Premiums Written Per Year to be Considered for Assessment Under Guaranty Fund	0.02
Guaranty Liabilities	131,000,000		138,000,000
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	247,000,000		276,000,000
GMWB Product Derivatives [Member]
Derivative Liability [Abstract]
Derivative Instrument, Collateral Payment, Preventing Termination	41,000,000
Single Notch Downgrade [Member]
Derivative Liability [Abstract]
Additional Collateral, Aggregate Fair Value	4,000,000
Double Notch Downgrade [Member]
Derivative Liability [Abstract]
Additional Collateral, Aggregate Fair Value	18,000,000
Other Assets [Member]
Derivative Liability [Abstract]
Loss Contingency Accrual, Insurance-related Assessment, Premium Tax Offset	$ 42,000,000		$ 37,000,000

[1] Excludes expected future minimum sublease income of approximately $3, $2, $2, $2, $2 and $3 in 2015, 2016, 2017, 2018, 2019 and thereafter respectively.