Fair Value Measurements (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Assets:
Available for sale (AFS) fixed maturities		$ 33,114	$ 30,734
Trading fixed maturities		269	266
Assets of managed investment entities (“MIE”)		3,613	3,108
Variable annuity assets (separate accounts)	[1]	595	662
Total assets accounted for at fair value		39,552	36,788
Liabilities:
Liabilities of managed investment entities		3,287	2,819
Total liabilities accounted for at fair value		4,487	3,992
Annuity benefits accumulated [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		1,198	1,160
Derivatives in long-term debt [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		(7)
Other liabilities — derivatives [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		9	13
U.S. Government and government agencies [Member]
Assets:
Available for sale (AFS) fixed maturities		335	353
States, municipalities and political subdivisions [Member]
Assets:
Available for sale (AFS) fixed maturities		7,166	6,747
Foreign government [Member]
Assets:
Available for sale (AFS) fixed maturities		166	194
Residential Mortgage Backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		3,879	4,442
Commercial Mortgage Backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		2,297	2,451
Asset-backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		4,701	3,887
All other corporate [Member]
Assets:
Available for sale (AFS) fixed maturities		14,570	12,660
Fixed maturities [Member]
Assets:
Available for sale (AFS) fixed maturities		33,114	30,734
Trading fixed maturities		269	266
Equity securities [Member]
Assets:
Equity securities		1,831	1,696
Other investments [Member]
Assets:
Derivatives included in other investments and other assets		122	322
Other assets [Member]
Assets:
Derivatives included in other investments and other assets		8
Level 1 [Member]
Assets:
Assets of managed investment entities (“MIE”)		155	174
Variable annuity assets (separate accounts)	[1]	0	0
Total assets accounted for at fair value		1,804	1,692
Liabilities:
Liabilities of managed investment entities		141	118
Total liabilities accounted for at fair value		141	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		115	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		163	200
Trading fixed maturities		13	12
Level 1 [Member] | Equity securities [Member]
Assets:
Equity securities		1,473	1,306
Level 1 [Member] | Other investments [Member]
Assets:
Derivatives included in other investments and other assets		0	0
Level 1 [Member] | Other assets [Member]
Assets:
Derivatives included in other investments and other assets		0
Level 2 [Member]
Assets:
Assets of managed investment entities (“MIE”)		3,432	2,903
Variable annuity assets (separate accounts)	[1]	595	662
Total assets accounted for at fair value		36,057	33,741
Liabilities:
Liabilities of managed investment entities		3,123	0
Total liabilities accounted for at fair value		3,125	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		(7)
Level 2 [Member] | Other liabilities — derivatives [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		9	13
Level 2 [Member] | U.S. Government and government agencies [Member]
Assets:
Available for sale (AFS) fixed maturities		205	174
Level 2 [Member] | States, municipalities and political subdivisions [Member]
Assets:
Available for sale (AFS) fixed maturities		7,073	6,647
Level 2 [Member] | Foreign government [Member]
Assets:
Available for sale (AFS) fixed maturities		166	194
Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		3,585	4,142
Level 2 [Member] | Commercial Mortgage Backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		2,252	2,407
Level 2 [Member] | Asset-backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		4,252	3,661
Level 2 [Member] | All other corporate [Member]
Assets:
Available for sale (AFS) fixed maturities		13,876	12,078
Level 2 [Member] | Fixed maturities [Member]
Assets:
Available for sale (AFS) fixed maturities		31,409	29,303
Trading fixed maturities		256	254
Level 2 [Member] | Equity securities [Member]
Assets:
Equity securities		235	297
Level 2 [Member] | Other investments [Member]
Assets:
Derivatives included in other investments and other assets		122	322
Level 2 [Member] | Other assets [Member]
Assets:
Derivatives included in other investments and other assets		8
Level 3 [Member]
Assets:
Assets of managed investment entities (“MIE”)		26	31
Variable annuity assets (separate accounts)	[1]	0	0
Total assets accounted for at fair value		1,691	1,355
Liabilities:
Liabilities of managed investment entities		23	2,701
Total liabilities accounted for at fair value		1,221	3,861
Level 3 [Member] | Annuity benefits accumulated [Member]
Liabilities:
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities		1,198	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		93	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		294	300
Level 3 [Member] | Commercial Mortgage Backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		45	44
Level 3 [Member] | Asset-backed Securities [Member]
Assets:
Available for sale (AFS) fixed maturities		449	226
Level 3 [Member] | All other corporate [Member]
Assets:
Available for sale (AFS) fixed maturities		646	546
Level 3 [Member] | Fixed maturities [Member]
Assets:
Available for sale (AFS) fixed maturities		1,542	1,231
Trading fixed maturities		0	0
Level 3 [Member] | Equity securities [Member]
Assets:
Equity securities		123	93
Level 3 [Member] | Other investments [Member]
Assets:
Derivatives included in other investments and other assets		0	$ 0
Level 3 [Member] | Other assets [Member]
Assets:
Derivatives included in other investments and other assets		$ 0

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