Fair Values of Assets and Liabilities (Level 3 rollforwards-Liabilities) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 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		$ 1,800	$ (158)
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		43	14
Total (gains) losses included in net income	[1]	(12)	2
Issues		2	7
Balance at the end of the period		33	23
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		881	628
Total (gains) losses included in net income	[1]	(145)	98
Issues		8	36
Settlements		(19)	(17)
Balance at the end of the period		725	745
Changes in unrealized (gains) losses in net income relating to liabilities held at the end of the period	[1]	(145)	98
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		763	328
Total (gains) losses included in net income	[2]	2,420	(230)
Issues		88	84
Settlements		5	(2)
Balance at the end of the period		3,276	180
Changes in unrealized (gains) losses in net income relating to liabilities held at the end of the period	[2]	2,423	(230)
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		0
Total (gains) losses included in net income	[2]	(3)
Issues		(6)
Balance at the end of the period		(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		1,687	970
Total (gains) losses included in net income		2,260	(130)
Issues		92	127
Settlements		(14)	(19)
Balance at the end of the period		4,025	948
Changes in unrealized (gains) losses in net income relating to liabilities held at the end of the period		$ 2,278	$ (132)

[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.