Income Taxes (Deferred Income Tax Assets and Liabilities) (Details 3) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Deferred income tax assets:
Liabilities for policyholder account balances, future policy benefits and claims	$ 1,391	$ 1,292
Deferred compensation	384	350
Investment related	118	83
Postretirement benefits	56
Loss carryovers and tax credit carryforwards		25
Other	87	102
Gross deferred income tax assets	2,036	1,852
Less: Valuation allowance	11	20
Total deferred income tax assets	2,025	1,832
Deferred income tax liabilities:
Deferred acquisition costs	730	738
Net unrealized gains on Available-for-Sale securities	233	424
Depreciation expense	169	131
Deferred sales inducement costs	125	128
Intangible assets	113	96
Goodwill	66
Other	18	101
Gross deferred income tax liabilities	1,454	1,618
Net deferred income tax liabilities	571	214
State net operating losses	16
Valuation allowance	$ 11	$ 20