Income Taxes - Deferred Income Taxes (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets [Abstract]
Employee and retiree benefit plans	$ 422	$ 765
Investments, net	25	84
Other insurance and contractholder liabilities	407	486
Deferred gain on sale of business	39	39
Policy acquisition expenses	142	147
Other accrued liabilities	157	164
Bad debt expense	24	21
Other	40	42
Deferred tax assets before valuation allowance	1,256	1,748
Valuation allowance for deferred tax assets	(49)	(42)
Deferred tax assets, net of valuation allowance	1,207	1,706
Deferred tax liabilities [Abstract]
Depreciation and amortization	700	704
Foreign operations, net	162	147
Unrealized appreciation (depreciation) on investments and foreign currency translation	253	481
Total deferred tax liabilities	1,115	1,332
Net deferred income tax assets	$ 92	$ 374