Income Taxes (Deferred Income Tax Assets and Liabilities) (Details 3) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred income tax assets:
Liabilities for policyholder account balances, future policy benefits and claims	$ 945	$ 725
Deferred compensation	406	329
Investment related	188	145
Deferred Tax Assets Right of Use Lease Liability	59	0
Postretirement benefits	45	44
Other	47	57
Gross deferred income tax assets	1,690	1,300
Less: Valuation allowance	19	20
Total deferred income tax assets	1,671	1,280
Deferred income tax liabilities:
Deferred acquisition costs	456	437
Net unrealized gains on Available-for-Sale securities	186	30
Intangible assets	115	104
Depreciation expense	94	101
Goodwill	64	60
Deferred Tax Liabilities Right of Use Lease Asset	54	0
Deferred sales inducement costs	50	53
Other	6	6
Gross deferred income tax liabilities	1,025	791
Valuation Allowance [Line Items]
Valuation allowance	19	20
Net deferred income tax liabilities	646	$ 489
State net operating losses	16
State and Local Jurisdiction [Member]
Deferred income tax assets:
Less: Valuation allowance	4
Valuation Allowance [Line Items]
Valuation allowance	4
Foreign Tax Authority [Member]
Deferred income tax assets:
Less: Valuation allowance	2
Valuation Allowance [Line Items]
Valuation allowance	$ 2