Fair Value Measurements (Details) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Assets:
Available for sale (AFS) fixed maturities		$ 33,921	$ 32,284
Trading fixed maturities		249	254
Assets of managed investment entities (“MIE”)		3,906	4,047
Variable annuity assets (separate accounts)	[1]	595	608
Total assets accounted for at fair value		40,606	39,155
Liabilities:
Liabilities of managed investment entities		3,656	3,781
Total liabilities accounted for at fair value		5,108	5,156
Annuity benefits accumulated [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		1,450	1,369
Derivatives in long-term debt [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		(8)	(2)
Other liabilities — derivatives [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		10	8
U.S. Government and government agencies [Member]
Assets:
Available for sale (AFS) fixed maturities		338	307
States, municipalities and political subdivisions [Member]
Assets:
Available for sale (AFS) fixed maturities		7,052	6,856
Foreign government [Member]
Assets:
Available for sale (AFS) fixed maturities		147	154
Residential Mortgage Backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		3,772	3,529
Commercial Mortgage Backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		2,136	2,187
Asset-backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		5,130	4,934
All other corporate [Member]
Assets:
Available for sale (AFS) fixed maturities		15,346	14,317
Fixed maturities [Member]
Assets:
Available for sale (AFS) fixed maturities		33,921	32,284
Trading fixed maturities		249	254
Equity securities [Member]
Assets:
Equity securities — AFS and trading		1,648	1,719
Other assets — derivatives [Member]
Assets:
Derivatives included in other investments and other assets		13	2
Level 1 [Member]
Assets:
Assets of managed investment entities (“MIE”)		177	309
Variable annuity assets (separate accounts)	[1]	0	0
Total assets accounted for at fair value		1,688	1,834
Liabilities:
Liabilities of managed investment entities		165	289
Total liabilities accounted for at fair value		165	289
Level 1 [Member] | Annuity benefits accumulated [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		0	0
Level 1 [Member] | Derivatives in long-term debt [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		0	0
Level 1 [Member] | Other liabilities — derivatives [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		0	0
Level 1 [Member] | U.S. Government and government agencies [Member]
Assets:
Available for sale (AFS) fixed maturities		105	100
Level 1 [Member] | States, municipalities and political subdivisions [Member]
Assets:
Available for sale (AFS) fixed maturities		0	0
Level 1 [Member] | Foreign government [Member]
Assets:
Available for sale (AFS) fixed maturities		0	0
Level 1 [Member] | Residential Mortgage Backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		0	0
Level 1 [Member] | Commercial Mortgage Backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		0	0
Level 1 [Member] | Asset-backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		0	0
Level 1 [Member] | All other corporate [Member]
Assets:
Available for sale (AFS) fixed maturities		37	50
Level 1 [Member] | Fixed maturities [Member]
Assets:
Available for sale (AFS) fixed maturities		142	150
Trading fixed maturities		10	13
Level 1 [Member] | Equity securities [Member]
Assets:
Equity securities — AFS and trading		1,359	1,362
Level 1 [Member] | Other assets — derivatives [Member]
Assets:
Derivatives included in other investments and other assets		0	0
Level 2 [Member]
Assets:
Assets of managed investment entities (“MIE”)		3,705	3,712
Variable annuity assets (separate accounts)	[1]	595	608
Total assets accounted for at fair value		37,147	35,685
Liabilities:
Liabilities of managed investment entities		3,468	3,468
Total liabilities accounted for at fair value		3,470	3,474
Level 2 [Member] | Annuity benefits accumulated [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		0	0
Level 2 [Member] | Derivatives in long-term debt [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		(8)	(2)
Level 2 [Member] | Other liabilities — derivatives [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		10	8
Level 2 [Member] | U.S. Government and government agencies [Member]
Assets:
Available for sale (AFS) fixed maturities		218	192
Level 2 [Member] | States, municipalities and political subdivisions [Member]
Assets:
Available for sale (AFS) fixed maturities		6,960	6,767
Level 2 [Member] | Foreign government [Member]
Assets:
Available for sale (AFS) fixed maturities		147	154
Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		3,559	3,305
Level 2 [Member] | Commercial Mortgage Backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		2,098	2,148
Level 2 [Member] | Asset-backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		4,629	4,464
Level 2 [Member] | All other corporate [Member]
Assets:
Available for sale (AFS) fixed maturities		14,579	13,634
Level 2 [Member] | Fixed maturities [Member]
Assets:
Available for sale (AFS) fixed maturities		32,190	30,664
Trading fixed maturities		239	241
Level 2 [Member] | Equity securities [Member]
Assets:
Equity securities — AFS and trading		131	217
Level 2 [Member] | Other assets — derivatives [Member]
Assets:
Derivatives included in other investments and other assets		13	2
Level 3 [Member]
Assets:
Assets of managed investment entities (“MIE”)		24	26
Variable annuity assets (separate accounts)	[1]	0	0
Total assets accounted for at fair value		1,771	1,636
Liabilities:
Liabilities of managed investment entities		23	24
Total liabilities accounted for at fair value		1,473	1,393
Level 3 [Member] | Annuity benefits accumulated [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		1,450	1,369
Level 3 [Member] | Derivatives in long-term debt [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		0	0
Level 3 [Member] | Other liabilities — derivatives [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		0	0
Level 3 [Member] | U.S. Government and government agencies [Member]
Assets:
Available for sale (AFS) fixed maturities		15	15
Level 3 [Member] | States, municipalities and political subdivisions [Member]
Assets:
Available for sale (AFS) fixed maturities		92	89
Level 3 [Member] | Foreign government [Member]
Assets:
Available for sale (AFS) fixed maturities		0	0
Level 3 [Member] | Residential Mortgage Backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		213	224
Level 3 [Member] | Commercial Mortgage Backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		38	39
Level 3 [Member] | Asset-backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		501	470
Level 3 [Member] | All other corporate [Member]
Assets:
Available for sale (AFS) fixed maturities		730	633
Level 3 [Member] | Fixed maturities [Member]
Assets:
Available for sale (AFS) fixed maturities		1,589	1,470
Trading fixed maturities		0	0
Level 3 [Member] | Equity securities [Member]
Assets:
Equity securities — AFS and trading		158	140
Level 3 [Member] | Other assets — derivatives [Member]
Assets:
Derivatives included in other investments and other assets		0	0
Equity index call options [Member] | Other investments — derivatives [Member]
Assets:
Derivatives included in other investments and other assets		274	241
Equity index call options [Member] | Level 1 [Member] | Other investments — derivatives [Member]
Assets:
Derivatives included in other investments and other assets		0	0
Equity index call options [Member] | Level 2 [Member] | Other investments — derivatives [Member]
Assets:
Derivatives included in other investments and other assets		274	241
Equity index call options [Member] | Level 3 [Member] | Other investments — derivatives [Member]
Assets:
Derivatives included in other investments and other assets		$ 0	$ 0

[1] Variable annuity liabilities equal the fair value of variable annuity assets.