Other Expenses (Other Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Income and Expenses [Abstract]
Employee-related costs (1)	$ 974	$ 869
Third party staffing costs	312	348
General and administrative expenses	108	190
Pension, postretirement and postemployment benefit costs	25	39
Premium taxes, other taxes, and licenses & fees	167	193
Commissions and other variable expenses	1,530	1,408
Capitalization of DAC	(775)	(774)
Amortization of DAC and VOBA	590	788
Amortization of negative VOBA	(9)	(10)
Interest expense on debt	228	222
Total other expenses	3,150	3,273
Net change in cash surrender value of investments, net of premiums paid	$ (16)	$ 40