Fair Value Measurements (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Assets:
Available for sale (AFS) fixed maturities		$ 32,260	$ 30,734
Trading fixed maturities		279	266
Assets of managed investment entities (“MIE”)		3,629	3,108
Variable annuity assets (separate accounts)	[1]	655	662
Other investments — derivatives		278	322
Other assets — derivatives		1
Total assets accounted for at fair value		38,806	36,788
Liabilities:
Liabilities of managed investment entities		3,309	2,819
Total liabilities accounted for at fair value		4,575	3,992
Annuity benefits accumulated [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		1,258	1,160
Derivatives in long-term debt [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		(2)
Other liabilities — derivatives [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		10	13
U.S. Government and government agencies [Member]
Assets:
Available for sale (AFS) fixed maturities		361	353
States, municipalities and political subdivisions [Member]
Assets:
Available for sale (AFS) fixed maturities		7,080	6,747
Foreign government [Member]
Assets:
Available for sale (AFS) fixed maturities		177	194
Residential Mortgage Backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		4,114	4,442
Commercial Mortgage Backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		2,323	2,451
Asset-backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		4,383	3,887
All other corporate [Member]
Assets:
Available for sale (AFS) fixed maturities		13,822	12,660
Fixed maturities [Member]
Assets:
Available for sale (AFS) fixed maturities		32,260	30,734
Trading fixed maturities		279	266
Equity securities [Member]
Assets:
Equity securities		1,704	1,696
Level 1 [Member]
Assets:
Assets of managed investment entities (“MIE”)		243	174
Variable annuity assets (separate accounts)	[1]	0	0
Other investments — derivatives		0	0
Other assets — derivatives		0
Total assets accounted for at fair value		1,842	1,692
Liabilities:
Liabilities of managed investment entities		222	118
Total liabilities accounted for at fair value		222	118
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
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		142	164
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		48	36
Level 1 [Member] | Fixed maturities [Member]
Assets:
Available for sale (AFS) fixed maturities		190	200
Trading fixed maturities		13	12
Level 1 [Member] | Equity securities [Member]
Assets:
Equity securities		1,396	1,306
Level 2 [Member]
Assets:
Assets of managed investment entities (“MIE”)		3,357	2,903
Variable annuity assets (separate accounts)	[1]	655	662
Other investments — derivatives		278	322
Other assets — derivatives		1
Total assets accounted for at fair value		35,445	33,741
Liabilities:
Liabilities of managed investment entities		3,061	0
Total liabilities accounted for at fair value		3,069	13
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		(2)
Level 2 [Member] | Other liabilities — derivatives [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		10	13
Level 2 [Member] | U.S. Government and government agencies [Member]
Assets:
Available for sale (AFS) fixed maturities		204	174
Level 2 [Member] | States, municipalities and political subdivisions [Member]
Assets:
Available for sale (AFS) fixed maturities		6,996	6,647
Level 2 [Member] | Foreign government [Member]
Assets:
Available for sale (AFS) fixed maturities		177	194
Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		3,818	4,142
Level 2 [Member] | Commercial Mortgage Backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		2,275	2,407
Level 2 [Member] | Asset-backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		4,051	3,661
Level 2 [Member] | All other corporate [Member]
Assets:
Available for sale (AFS) fixed maturities		13,177	12,078
Level 2 [Member] | Fixed maturities [Member]
Assets:
Available for sale (AFS) fixed maturities		30,698	29,303
Trading fixed maturities		266	254
Level 2 [Member] | Equity securities [Member]
Assets:
Equity securities		190	297
Level 3 [Member]
Assets:
Assets of managed investment entities (“MIE”)		29	31
Variable annuity assets (separate accounts)	[1]	0	0
Other investments — derivatives		0	0
Other assets — derivatives		0
Total assets accounted for at fair value		1,519	1,355
Liabilities:
Liabilities of managed investment entities		26	2,701
Total liabilities accounted for at fair value		1,284	3,861
Level 3 [Member] | Annuity benefits accumulated [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		1,258	1,160
Level 3 [Member] | Derivatives in long-term debt [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		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		84	100
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		296	300
Level 3 [Member] | Commercial Mortgage Backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		48	44
Level 3 [Member] | Asset-backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		332	226
Level 3 [Member] | All other corporate [Member]
Assets:
Available for sale (AFS) fixed maturities		597	546
Level 3 [Member] | Fixed maturities [Member]
Assets:
Available for sale (AFS) fixed maturities		1,372	1,231
Trading fixed maturities		0	0
Level 3 [Member] | Equity securities [Member]
Assets:
Equity securities		$ 118	$ 93

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