Other Expenses (Other Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Other Income and Expenses [Abstract]
Employee-related costs (1)	$ 869	$ 922
Third party staffing costs	348	369
General and administrative expenses	190	223
Pension, postretirement and postemployment benefit costs	39	56
Premium taxes, other taxes, and licenses & fees	193	170
Commissions and other variable expenses	1,408	1,449
Capitalization of DAC	(774)	(812)
Amortization of DAC and VOBA	788	624
Amortization of negative VOBA	(10)	(10)
Interest expense on debt	222	234
Total other expenses	3,273	3,225
Net change in cash surrender value of investments, net of premiums paid	$ 40	$ (76)