Other Expenses (Other Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Income and Expenses [Abstract]
Employee-related costs (1)	$ 808	$ 842	$ 1,782	$ 1,711
Third party staffing costs	336	311	648	659
General and administrative expenses	135	191	243	381
Pension, postretirement and postemployment benefit costs	26	37	51	76
Premium taxes, other taxes, and licenses & fees	169	176	336	369
Commissions and other variable expenses	1,294	1,315	2,824	2,723
Capitalization of DAC	(642)	(671)	(1,417)	(1,445)
Amortization of DAC and VOBA	537	560	1,127	1,348
Amortization of negative VOBA	(10)	(10)	(19)	(20)
Interest expense on debt	228	232	456	454
Total other expenses	2,881	2,983	6,031	6,256
Net change in cash surrender value of investments, net of premiums paid	$ (58)	$ (80)	$ (74)	$ (40)