Other Expenses (Other Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Income and Expenses [Abstract]
Employee-related costs (1)	$ 794	$ 866	$ 2,576	$ 2,577
Third party staffing costs	353	309	1,001	968
General and administrative expenses	212	172	455	553
Pension, postretirement and postemployment benefit costs	43	37	94	113
Premium taxes, other taxes, and licenses & fees	144	194	480	563
Commissions and other variable expenses	1,323	1,376	4,147	4,099
Capitalization of DAC	(635)	(764)	(2,052)	(2,209)
Amortization of DAC and VOBA	816	1,066	1,943	2,414
Amortization of negative VOBA	(6)	(15)	(25)	(35)
Interest expense on debt	240	229	696	683
Total other expenses	3,284	3,470	9,315	9,726
Net change in cash surrender value of investments, net of premiums paid	$ (15)	$ (44)	$ (89)	$ (84)