Other Expenses (Other Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Other Income and Expenses [Abstract]
Employee-related costs (1)	$ 842	$ 916	$ 1,711	$ 1,838
Third party staffing costs	311	420	659	789
General and administrative expenses	191	237	381	460
Pension, postretirement and postemployment benefit costs	37	57	76	113
Premium taxes, other taxes, and licenses & fees	176	174	369	344
Commissions and other variable expenses	1,315	1,470	2,723	2,919
Capitalization of DAC	(671)	(837)	(1,445)	(1,649)
Amortization of DAC and VOBA	560	689	1,348	1,313
Amortization of negative VOBA	(10)	(10)	(20)	(20)
Interest expense on debt	232	274	454	508
Total other expenses	2,983	3,390	6,256	6,615
Net change in cash surrender value of investments, net of premiums paid	$ (80)	$ (41)	$ (40)	$ (117)