Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in Accounting Estimate [Line Items]
Total income tax expense (benefit)		$ 947	$ 822	$ (1,438)
Total provision for income tax expense (benefit)			$ (3,033)	$ (2,880)
Effective tax rate		18.60%	17.00%	(22.20%)
U.S. federal income tax rate		21.00%		35.00%
Tax expense related to remeasuring Korea’s deferred tax assets and liabilities			$ 26
DRD constituting non-taxable investment income		$ 122	127	$ 280
Non-taxable investment income		$ 270	246	369
Percent of income tax expense (benefit)		5.00%
Income (loss) from domestic operations		$ 1,985	1,447	2,541
Income (loss) from foreign operations		3,101	3,387	$ 3,945
Polish and Italian insurance operations
Change in Accounting Estimate [Line Items]
Total income tax expense (benefit)			10
Korea insurance operations
Change in Accounting Estimate [Line Items]
Total income tax expense (benefit)			14
U.S. Tax Cut and Jobs Act of 2017
Change in Accounting Estimate [Line Items]
Total provision for income tax expense (benefit)			(153)
Industry Issue Resolution
Change in Accounting Estimate [Line Items]
Tax adjustment impact	$ (198)
Brazil Full Inclusion
Change in Accounting Estimate [Line Items]
Tax adjustment impact		$ 3	$ (34)
Japan Statutory Tax Rate
Change in Accounting Estimate [Line Items]
Effective tax rate		28.00%
Korea Statutory Tax Rate
Change in Accounting Estimate [Line Items]
Effective tax rate		24.20%
Brazil Statutory Tax Rate
Change in Accounting Estimate [Line Items]
Effective tax rate			45.00%