Fair Values of Assets and Liabilities (Level 3 rollforwards-Liabilities) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 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		$ 569	$ 43	$ (1,200)	$ (115)
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		33	23	43	14
Total (gains) losses included in net income	[1]	7	1	(5)	3
Issues		1	7	3	14
Settlements			0		0
Balance at the end of the period		41	31	41	31
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		725	745	881	628
Total (gains) losses included in net income	[1]	148	60	3	158
Issues		30	31	38	67
Settlements		(21)	(17)	(40)	(34)
Balance at the end of the period		882	819	882	819
Changes in unrealized (gains) losses in net income relating to liabilities held at the end of the period	[1]	148	60	3	158
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		3,276	180	763	328
Total (gains) losses included in net income	[2]	(224)	433	2,196	203
Issues		86	86	174	170
Settlements		(9)	(3)	(4)	(5)
Balance at the end of the period		3,129	696	3,129	696
Changes in unrealized (gains) losses in net income relating to liabilities held at the end of the period	[2]	(204)	430	2,219	200
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]	16		13
Issues		2		(4)
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		4,025	948	1,687	970
Total (gains) losses included in net income		(53)	494	2,207	364
Issues		119	124	211	251
Settlements		(30)	(20)	(44)	(39)
Balance at the end of the period		4,061	1,546	4,061	1,546
Changes in unrealized (gains) losses in net income relating to liabilities held at the end of the period		$ (56)	$ 490	$ 2,222	$ 358

[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.