Consolidated Supplementary Insurance Information (Income Statement Items) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Premiums and Universal Life and Investment-Type Product Policy Fees	$ 4,462	$ 4,735	$ 4,761
Net Investment Income (1)	3,579	3,338	3,078
Policyholder Benefits and Claims and Interest Credited to Policyholder Account Balances	4,733	4,351	4,747
Amortization of DAC and VOBA	382	1,050	227
Other Expenses	2,491	2,575	2,483
Corporate & Other
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Premiums and Universal Life and Investment-Type Product Policy Fees	85	85	96
Net Investment Income (1)	75	57	141
Policyholder Benefits and Claims and Interest Credited to Policyholder Account Balances	59	64	62
Amortization of DAC and VOBA	14	16	20
Other Expenses	404	503	374
Annuities
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Premiums and Universal Life and Investment-Type Product Policy Fees	2,788	2,947	3,000
Net Investment Income (1)	1,797	1,522	1,252
Policyholder Benefits and Claims and Interest Credited to Policyholder Account Balances	1,414	1,597	2,130
Amortization of DAC and VOBA	363	944	(23)
Other Expenses	1,676	1,629	1,565
Life
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Premiums and Universal Life and Investment-Type Product Policy Fees	871	927	951
Net Investment Income (1)	434	447	327
Policyholder Benefits and Claims and Interest Credited to Policyholder Account Balances	824	768	820
Amortization of DAC and VOBA	5	90	223
Other Expenses	211	241	265
Run-off
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Premiums and Universal Life and Investment-Type Product Policy Fees	718	776	714
Net Investment Income (1)	1,273	1,312	1,358
Policyholder Benefits and Claims and Interest Credited to Policyholder Account Balances	2,436	1,922	1,735
Amortization of DAC and VOBA	0	0	7
Other Expenses	$ 200	$ 202	$ 279