Fair Values of Assets and Liabilities (Level 3 rollforwards-Liabilities) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Summary of changes in Level 3 liabilities measured at fair value on a recurring basis [Rollforward]
Net increase (decrease) to pretax income from adjustment for nonperformance risk on the fair value of embedded derivatives		$ (123)	$ 85	$ 446	$ (29)
Fixed deferred indexed annuity embedded derivatives [Member]
Summary of changes in Level 3 liabilities measured at fair value on a recurring basis [Rollforward]
Balance at the beginning of the period		41	31	43	14
Total (gains) losses included in net income	[1]	3		(2)	3
Issues			6	3	20
Balance at the end of the period		44	37	44	37
IUL embedded derivatives [Member]
Summary of changes in Level 3 liabilities measured at fair value on a recurring basis [Rollforward]
Balance at the beginning of the period		882	819	881	628
Total (gains) losses included in net income	[1]	50	(5)	53	153
Issues		15	25	53	92
Settlements		(21)	(17)	(61)	(51)
Balance at the end of the period		926	822	926	822
Changes in unrealized (gains) losses in net income relating to liabilities held at the end of the period	[1]	50	(5)	53	153
GMWB and GMAB embedded derivatives [Member]
Summary of changes in Level 3 liabilities measured at fair value on a recurring basis [Rollforward]
Balance at the beginning of the period		3,129	696	763	328
Total (gains) losses included in net income	[2]	(296)	663	1,900	866
Issues		93	96	267	266
Settlements		17	(3)	13	(8)
Balance at the end of the period		2,943	1,452	2,943	1,452
Changes in unrealized (gains) losses in net income relating to liabilities held at the end of the period	[2]	(283)	660	1,936	859
Structured annuity embedded derivatives [Member]
Summary of changes in Level 3 liabilities measured at fair value on a recurring basis [Rollforward]
Balance at the beginning of the period		9		0
Total (gains) losses included in net income	[2]	3		16
Issues		(3)		(7)
Balance at the end of the period		9		9
Total [Member]
Summary of changes in Level 3 liabilities measured at fair value on a recurring basis [Rollforward]
Balance at the beginning of the period		4,061	1,546	1,687	970
Total (gains) losses included in net income		(240)	658	1,967	1,022
Issues		105	127	316	378
Settlements		(4)	(20)	(48)	(59)
Balance at the end of the period		3,922	2,311	3,922	2,311
Changes in unrealized (gains) losses in net income relating to liabilities held at the end of the period		$ (233)	$ 655	$ 1,989	$ 1,012

[1] Included in interest credited to fixed accounts in the Consolidated Statements of Income.

[2] Included in benefits, claims, losses and settlement expenses in the Consolidated Statements of Income.