Other Expenses (Other Expenses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Employee related costs (1)	$ 3,665	$ 3,664	$ 3,595
Third party staffing costs	1,755	1,703	1,693
General and administrative expenses	901	910	1,129
Pension, postretirement and postemployment benefit costs	233	185	307
Premium taxes, other taxes, and licenses & fees	674	758	842
Commissions and other variable expenses	6,001	5,707	5,387
Capitalization of DAC	(3,358)	(3,254)	(3,002)
Amortization of DAC and VOBA	2,896	2,975	2,681
Amortization of negative VOBA	(33)	(56)	(140)
Interest expense on debt	955	1,122	1,129
Total other expenses	13,689	13,714	13,621
Net change in cash surrender value of investments, net of premiums paid	$ (219)	$ 0	$ (124)