Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Assets:
Assets of managed investment entities (MIE)	$ 2,888		$ 3,225
Variable annuity assets (separate accounts)	665	[1]	580	[1]
Other investments — derivatives	274		133
Total assets accounted for at fair value	31,767		29,316
Liabilities:
Liabilities of managed investment entities	2,567		2,892
Total liabilities accounted for at fair value	3,381		3,374
Annuity benefits accumulated [Member]
Liabilities:
Derivatives included in annuity benefits accumulated and other liabilities	804		465
Other liabilities [Member]
Liabilities:
Derivatives included in annuity benefits accumulated and other liabilities	10		17
U.S. Government and government agencies [Member]
Assets:
Total AFS securities	314		388
States, municipalities and political subdivisions [Member]
Assets:
Total AFS securities	5,372		4,468
Foreign government [Member]
Assets:
Total AFS securities	208		260
Residential Mortgage Backed Securities [Member]
Assets:
Total AFS securities	4,310		4,204
Commercial Mortgage Backed Securities [Member]
Assets:
Total AFS securities	2,724		2,918
Asset-backed Securities [Member]
Assets:
Total AFS securities	2,493		1,640
All other corporate [Member]
Assets:
Total AFS securities	11,035		10,240
Fixed maturities [Member]
Assets:
Total AFS securities	26,456		24,118
Trading fixed maturities	305		321
Equity securities [Member]
Assets:
Total AFS securities	1,179		939
Level 1 [Member]
Assets:
Assets of managed investment entities (MIE)	266		256
Variable annuity assets (separate accounts)	0	[1]	0	[1]
Other investments — derivatives	0		0
Total assets accounted for at fair value	1,464		1,269
Liabilities:
Liabilities of managed investment entities	156		147
Total liabilities accounted for at fair value	156		147
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	147		227
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	28		5
Level 1 [Member] | Fixed maturities [Member]
Assets:
Total AFS securities	175		232
Trading fixed maturities	0		0
Level 1 [Member] | Equity securities [Member]
Assets:
Total AFS securities	1,023		781
Level 2 [Member]
Assets:
Assets of managed investment entities (MIE)	2,592		2,929
Variable annuity assets (separate accounts)	665	[1]	580	[1]
Other investments — derivatives	274		133
Total assets accounted for at fair value	29,412		27,010
Liabilities:
Liabilities of managed investment entities	0		0
Total liabilities accounted for at fair value	10		17
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	10		17
Level 2 [Member] | U.S. Government and government agencies [Member]
Assets:
Total AFS securities	152		141
Level 2 [Member] | States, municipalities and political subdivisions [Member]
Assets:
Total AFS securities	5,311		4,410
Level 2 [Member] | Foreign government [Member]
Assets:
Total AFS securities	208		260
Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Assets:
Total AFS securities	3,994		3,833
Level 2 [Member] | Commercial Mortgage Backed Securities [Member]
Assets:
Total AFS securities	2,696		2,896
Level 2 [Member] | Asset-backed Securities [Member]
Assets:
Total AFS securities	2,418		1,387
Level 2 [Member] | All other corporate [Member]
Assets:
Total AFS securities	10,672		9,999
Level 2 [Member] | Fixed maturities [Member]
Assets:
Total AFS securities	25,451		22,926
Trading fixed maturities	305		321
Level 2 [Member] | Equity securities [Member]
Assets:
Total AFS securities	125		121
Level 3 [Member]
Assets:
Assets of managed investment entities (MIE)	30		40
Variable annuity assets (separate accounts)	0	[1]	0	[1]
Other investments — derivatives	0		0
Total assets accounted for at fair value	891		1,037
Liabilities:
Liabilities of managed investment entities	2,411		2,745
Total liabilities accounted for at fair value	3,215		3,210
Level 3 [Member] | Annuity benefits accumulated [Member]
Liabilities:
Derivatives included in annuity benefits accumulated and other liabilities	804		465
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		20
Level 3 [Member] | States, municipalities and political subdivisions [Member]
Assets:
Total AFS securities	61		58
Level 3 [Member] | Foreign government [Member]
Assets:
Total AFS securities	0		0
Level 3 [Member] | Residential Mortgage Backed Securities [Member]
Assets:
Total AFS securities	316		371
Level 3 [Member] | Commercial Mortgage Backed Securities [Member]
Assets:
Total AFS securities	28		22
Level 3 [Member] | Asset-backed Securities [Member]
Assets:
Total AFS securities	75		253
Level 3 [Member] | All other corporate [Member]
Assets:
Total AFS securities	335		236
Level 3 [Member] | Fixed maturities [Member]
Assets:
Total AFS securities	830		960
Trading fixed maturities	0		0
Level 3 [Member] | Equity securities [Member]
Assets:
Total AFS securities	$ 31		$ 37

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