Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Assets:
Assets of managed investment entities (MIE)	$ 2,946		$ 2,888
Variable annuity assets (separate accounts)	649	[1]	665	[1]
Other investments — derivatives	288		274
Total assets accounted for at fair value	35,664		31,767
Liabilities:
Liabilities of managed investment entities	2,625		2,567
Total liabilities accounted for at fair value	3,723		3,381
Annuity benefits accumulated [Member]
Liabilities:
Derivatives included in annuity benefits accumulated and other liabilities	1,085		804
Other liabilities [Member]
Liabilities:
Derivatives included in annuity benefits accumulated and other liabilities	13		10
U.S. Government and government agencies [Member]
Assets:
Total AFS securities	365		314
States, municipalities and political subdivisions [Member]
Assets:
Total AFS securities	6,370		5,372
Foreign government [Member]
Assets:
Total AFS securities	204		208
Residential Mortgage Backed Securities [Member]
Assets:
Total AFS securities	4,589		4,310
Commercial Mortgage Backed Securities [Member]
Assets:
Total AFS securities	2,491		2,724
Asset-backed Securities [Member]
Assets:
Total AFS securities	3,619		2,493
All other corporate [Member]
Assets:
Total AFS securities	12,327		11,035
Fixed maturities [Member]
Assets:
Total AFS securities	29,965		26,456
Trading fixed maturities	342		305
Equity securities [Member]
Assets:
Total AFS securities	1,474		1,179
Level 1 [Member]
Assets:
Assets of managed investment entities (MIE)	281		266
Variable annuity assets (separate accounts)	0	[1]	0	[1]
Other investments — derivatives	0		0
Total assets accounted for at fair value	1,814		1,464
Liabilities:
Liabilities of managed investment entities	242		156
Total liabilities accounted for at fair value	242		156
Level 1 [Member] | Annuity benefits accumulated [Member]
Liabilities:
Derivatives included in annuity benefits accumulated and other liabilities	0		0
Level 1 [Member] | Other liabilities [Member]
Liabilities:
Derivatives included in annuity benefits accumulated and other liabilities	0		0
Level 1 [Member] | U.S. Government and government agencies [Member]
Assets:
Total AFS securities	168		147
Level 1 [Member] | States, municipalities and political subdivisions [Member]
Assets:
Total AFS securities	0		0
Level 1 [Member] | Foreign government [Member]
Assets:
Total AFS securities	0		0
Level 1 [Member] | Residential Mortgage Backed Securities [Member]
Assets:
Total AFS securities	0		0
Level 1 [Member] | Commercial Mortgage Backed Securities [Member]
Assets:
Total AFS securities	0		0
Level 1 [Member] | Asset-backed Securities [Member]
Assets:
Total AFS securities	0		0
Level 1 [Member] | All other corporate [Member]
Assets:
Total AFS securities	30		28
Level 1 [Member] | Fixed maturities [Member]
Assets:
Total AFS securities	198		175
Trading fixed maturities	30		0
Level 1 [Member] | Equity securities [Member]
Assets:
Total AFS securities	1,305		1,023
Level 2 [Member]
Assets:
Assets of managed investment entities (MIE)	2,636		2,592
Variable annuity assets (separate accounts)	649	[1]	665	[1]
Other investments — derivatives	288		274
Total assets accounted for at fair value	32,748		29,412
Liabilities:
Liabilities of managed investment entities	0		0
Total liabilities accounted for at fair value	13		10
Level 2 [Member] | Annuity benefits accumulated [Member]
Liabilities:
Derivatives included in annuity benefits accumulated and other liabilities	0		0
Level 2 [Member] | Other liabilities [Member]
Liabilities:
Derivatives included in annuity benefits accumulated and other liabilities	13		10
Level 2 [Member] | U.S. Government and government agencies [Member]
Assets:
Total AFS securities	182		152
Level 2 [Member] | States, municipalities and political subdivisions [Member]
Assets:
Total AFS securities	6,304		5,311
Level 2 [Member] | Foreign government [Member]
Assets:
Total AFS securities	204		208
Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Assets:
Total AFS securities	4,326		3,994
Level 2 [Member] | Commercial Mortgage Backed Securities [Member]
Assets:
Total AFS securities	2,464		2,696
Level 2 [Member] | Asset-backed Securities [Member]
Assets:
Total AFS securities	3,440		2,418
Level 2 [Member] | All other corporate [Member]
Assets:
Total AFS securities	11,855		10,672
Level 2 [Member] | Fixed maturities [Member]
Assets:
Total AFS securities	28,775		25,451
Trading fixed maturities	312		305
Level 2 [Member] | Equity securities [Member]
Assets:
Total AFS securities	88		125
Level 3 [Member]
Assets:
Assets of managed investment entities (MIE)	29		30
Variable annuity assets (separate accounts)	0	[1]	0	[1]
Other investments — derivatives	0		0
Total assets accounted for at fair value	1,102		891
Liabilities:
Liabilities of managed investment entities	2,383		2,411
Total liabilities accounted for at fair value	3,468		3,215
Level 3 [Member] | Annuity benefits accumulated [Member]
Liabilities:
Derivatives included in annuity benefits accumulated and other liabilities	1,085		804
Level 3 [Member] | Other liabilities [Member]
Liabilities:
Derivatives included in annuity benefits accumulated and other liabilities	0		0
Level 3 [Member] | U.S. Government and government agencies [Member]
Assets:
Total AFS securities	15		15
Level 3 [Member] | States, municipalities and political subdivisions [Member]
Assets:
Total AFS securities	66		61
Level 3 [Member] | Foreign government [Member]
Assets:
Total AFS securities	0		0
Level 3 [Member] | Residential Mortgage Backed Securities [Member]
Assets:
Total AFS securities	263		316
Level 3 [Member] | Commercial Mortgage Backed Securities [Member]
Assets:
Total AFS securities	27		28
Level 3 [Member] | Asset-backed Securities [Member]
Assets:
Total AFS securities	179		75
Level 3 [Member] | All other corporate [Member]
Assets:
Total AFS securities	442		335
Level 3 [Member] | Fixed maturities [Member]
Assets:
Total AFS securities	992		830
Trading fixed maturities	0		0
Level 3 [Member] | Equity securities [Member]
Assets:
Total AFS securities	$ 81		$ 31

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