Income Taxes (Deferred Income Tax Assets and Liabilities) (Details 3) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred income tax assets:
Liabilities for policyholder account balances, future policy benefits and claims	$ 1,618	$ 945
Deferred compensation	493	406
Postretirement benefits	65	45
Deferred Tax Assets Right of Use Lease Liability	60	59
Investment related	0	188
Other	51	47
Gross deferred income tax assets	2,287	1,690
Less: Valuation allowance	15	19
Total deferred income tax assets	2,272	1,671
Deferred income tax liabilities:
Deferred acquisition costs	435	456
Net unrealized gains on Available-for-Sale securities	295	186
Deferred Tax Liabilities, Investments	253	0
Intangible assets	124	115
Depreciation expense	99	94
Goodwill	70	64
Deferred Tax Liabilities Right of Use Lease Asset	54	54
Deferred sales inducement costs	44	50
Other	18	6
Gross deferred income tax liabilities	1,392	1,025
Net deferred income tax liabilities	880	646
Valuation Allowance [Line Items]
Valuation allowance	15	$ 19
State net operating losses	16
State and Local Jurisdiction [Member]
Deferred income tax assets:
Less: Valuation allowance	2
Valuation Allowance [Line Items]
Valuation allowance	2
Operating Loss Carryforwards, Valuation Allowance	11
Foreign Tax Authority [Member]
Deferred income tax assets:
Less: Valuation allowance	2
Valuation Allowance [Line Items]
Valuation allowance	$ 2