Income Taxes (Deferred Income Tax Assets and Liabilities) (Details 3) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred income tax assets:
Liabilities for policyholder account balances, future policy benefits and claims	$ 725	$ 620
Deferred compensation	329	345
Investment related	145	245
Postretirement benefits	44	34
Other	57	66
Gross deferred income tax assets	1,300	1,310
Less: Valuation allowance	20	17
Total deferred income tax assets	1,280	1,293
Deferred income tax liabilities:
Deferred acquisition costs	437	446
Intangible assets	104	93
Depreciation expense	101	93
Goodwill	60	52
Deferred sales inducement costs	53	62
Net unrealized gains on Available-for-Sale securities	30	162
Other	6	7
Gross deferred income tax liabilities	791	915
Net deferred income tax liabilities	489	378
State net operating losses	20
Valuation allowance	$ 20	$ 17