Commitments and Contingencies (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Guarantor Obligations [Line Items]
Asbestos reserves, net	$ 1,700,000,000	$ 1,800,000,000
Environmental reserves, net	276,000,000	297,000,000
Total rental expenses on operating leases	79,000,000	105,000,000	122,000,000
Sublease rental income	8,000,000	6,000,000	13,000,000
Expected future minimum sublease rental income									4,000,000
Expected future minimum sublease rental income, In year two				0	0	0	0	3,000,000
Total unfunded commitments	703,000,000
Commitments to fund limited partnership and other alternative investments	531,000,000
Commitments to fund mortgage loans	165,000,000
Minimum percentage of premiums written per year	1.00%
Maximum percentage of premiums written per year	2.00%
Liabilities for guaranty fund and other insurance-related assessments	138,000,000	160,000,000
Premium tax offsets	37,000,000	34,000,000
Expected assessment related to executive insurance plan			22,000,000
Fair value of all derivative instruments with credit-risk-related contingent features	1,200,000,000
Collateral posted by insurance operating entities	1,400,000,000
Notional Amount	159,441,000,000	169,762,000,000
Fair Value	(737,000,000)	(279,000,000)
GMWB product derivatives [Member]
Guarantor Obligations [Line Items]
Derivative Instrument, Collateral Payment, Preventing Termination	44,000,000
Single Notch Downgrade [Member]
Guarantor Obligations [Line Items]
Additional assets to be posted as collateral	12,000,000
Double Notch Downgrade [Member]
Guarantor Obligations [Line Items]
Additional assets to be posted as collateral	$ 33,000,000