Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Assets:
Assets of managed investment entities (MIE)	$ 2,723		$ 2,888
Variable annuity assets (separate accounts)	666	[1]	665	[1]
Other investments — derivatives	288		274
Total assets accounted for at fair value	32,661		31,767
Liabilities:
Liabilities of managed investment entities	2,413		2,567
Total liabilities accounted for at fair value	3,329		3,381
Annuity benefits accumulated [Member]
Liabilities:
Derivatives included in annuity benefits accumulated and other liabilities	904		804
Other liabilities [Member]
Liabilities:
Derivatives included in annuity benefits accumulated and other liabilities	12		10
U.S. Government and government agencies [Member]
Assets:
Total AFS securities	321		314
States, municipalities and political subdivisions [Member]
Assets:
Total AFS securities	5,723		5,372
Foreign government [Member]
Assets:
Total AFS securities	193		208
Residential Mortgage Backed Securities [Member]
Assets:
Total AFS securities	4,581		4,310
Commercial Mortgage Backed Securities [Member]
Assets:
Total AFS securities	2,619		2,724
Asset-backed Securities [Member]
Assets:
Total AFS securities	2,760		2,493
All other corporate [Member]
Assets:
Total AFS securities	11,193		11,035
Fixed maturities [Member]
Assets:
Total AFS securities	27,390		26,456
Trading fixed maturities	297		305
Equity securities [Member]
Assets:
Total AFS securities	1,297		1,179
Level 1 [Member]
Assets:
Assets of managed investment entities (MIE)	267		266
Variable annuity assets (separate accounts)	0	[1]	0	[1]
Other investments — derivatives	0		0
Total assets accounted for at fair value	1,508		1,464
Liabilities:
Liabilities of managed investment entities	91		156
Total liabilities accounted for at fair value	91		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	152		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	182		175
Trading fixed maturities	0		0
Level 1 [Member] | Equity securities [Member]
Assets:
Total AFS securities	1,059		1,023
Level 2 [Member]
Assets:
Assets of managed investment entities (MIE)	2,427		2,592
Variable annuity assets (separate accounts)	666	[1]	665	[1]
Other investments — derivatives	288		274
Total assets accounted for at fair value	30,179		29,412
Liabilities:
Liabilities of managed investment entities	0		0
Total liabilities accounted for at fair value	12		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	12		10
Level 2 [Member] | U.S. Government and government agencies [Member]
Assets:
Total AFS securities	154		152
Level 2 [Member] | States, municipalities and political subdivisions [Member]
Assets:
Total AFS securities	5,662		5,311
Level 2 [Member] | Foreign government [Member]
Assets:
Total AFS securities	193		208
Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Assets:
Total AFS securities	4,309		3,994
Level 2 [Member] | Commercial Mortgage Backed Securities [Member]
Assets:
Total AFS securities	2,591		2,696
Level 2 [Member] | Asset-backed Securities [Member]
Assets:
Total AFS securities	2,554		2,418
Level 2 [Member] | All other corporate [Member]
Assets:
Total AFS securities	10,841		10,672
Level 2 [Member] | Fixed maturities [Member]
Assets:
Total AFS securities	26,304		25,451
Trading fixed maturities	297		305
Level 2 [Member] | Equity securities [Member]
Assets:
Total AFS securities	197		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	974		891
Liabilities:
Liabilities of managed investment entities	2,322		2,411
Total liabilities accounted for at fair value	3,226		3,215
Level 3 [Member] | Annuity benefits accumulated [Member]
Liabilities:
Derivatives included in annuity benefits accumulated and other liabilities	904		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	61		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	272		316
Level 3 [Member] | Commercial Mortgage Backed Securities [Member]
Assets:
Total AFS securities	28		28
Level 3 [Member] | Asset-backed Securities [Member]
Assets:
Total AFS securities	206		75
Level 3 [Member] | All other corporate [Member]
Assets:
Total AFS securities	322		335
Level 3 [Member] | Fixed maturities [Member]
Assets:
Total AFS securities	904		830
Trading fixed maturities	0		0
Level 3 [Member] | Equity securities [Member]
Assets:
Total AFS securities	$ 41		$ 31

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