Adoption of ASU 2018-12 (Cumulative Effect Adjustments to Components of Stockholders’ Equity) (Details) - Accounting Standards Update 2018-12 [Member] - Cumulative Effect, Period of Adoption, Adjustment [Member] $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
DAC, VOBA, DSI and DFEL	$ 2,271
Additional liabilities for other insurance benefits	1,197
Liability for future policy benefits and other	(1,641)
MRBs	1,175
Total	3,002
Retained Earnings [Member]
Liability for future policy benefits and other	(121)
MRBs	(1,699)
Total	(1,820)
Accumulated Other Comprehensive Income (Loss) [Member]
DAC, VOBA, DSI and DFEL	2,271
Additional liabilities for other insurance benefits	1,197
Liability for future policy benefits and other	(1,520)
MRBs	2,874
Total	$ 4,822