Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Assets:
Assets of managed investment entities (MIE)	$ 2,799		$ 2,888
Variable annuity assets (separate accounts)	681	[1]	665	[1]
Other investments — derivatives	313		274
Total assets accounted for at fair value	34,597		31,767
Liabilities:
Liabilities of managed investment entities	2,499		2,567
Total liabilities accounted for at fair value	3,538		3,381
Annuity benefits accumulated [Member]
Liabilities:
Derivatives included in annuity benefits accumulated and other liabilities	1,026		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	349		314
States, municipalities and political subdivisions [Member]
Assets:
Total AFS securities	6,228		5,372
Foreign government [Member]
Assets:
Total AFS securities	138		208
Residential Mortgage Backed Securities [Member]
Assets:
Total AFS securities	4,684		4,310
Commercial Mortgage Backed Securities [Member]
Assets:
Total AFS securities	2,583		2,724
Asset-backed Securities [Member]
Assets:
Total AFS securities	3,219		2,493
All other corporate [Member]
Assets:
Total AFS securities	11,787		11,035
Fixed maturities [Member]
Assets:
Total AFS securities	28,988		26,456
Trading fixed maturities	343		305
Equity securities [Member]
Assets:
Total AFS securities	1,473		1,179
Level 1 [Member]
Assets:
Assets of managed investment entities (MIE)	232		266
Variable annuity assets (separate accounts)	0	[1]	0	[1]
Other investments — derivatives	0		0
Total assets accounted for at fair value	1,646		1,464
Liabilities:
Liabilities of managed investment entities	177		156
Total liabilities accounted for at fair value	177		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	31		0
Level 1 [Member] | Equity securities [Member]
Assets:
Total AFS securities	1,185		1,023
Level 2 [Member]
Assets:
Assets of managed investment entities (MIE)	2,540		2,592
Variable annuity assets (separate accounts)	681	[1]	665	[1]
Other investments — derivatives	313		274
Total assets accounted for at fair value	31,966		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	166		152
Level 2 [Member] | States, municipalities and political subdivisions [Member]
Assets:
Total AFS securities	6,167		5,311
Level 2 [Member] | Foreign government [Member]
Assets:
Total AFS securities	138		208
Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Assets:
Total AFS securities	4,428		3,994
Level 2 [Member] | Commercial Mortgage Backed Securities [Member]
Assets:
Total AFS securities	2,555		2,696
Level 2 [Member] | Asset-backed Securities [Member]
Assets:
Total AFS securities	3,015		2,418
Level 2 [Member] | All other corporate [Member]
Assets:
Total AFS securities	11,444		10,672
Level 2 [Member] | Fixed maturities [Member]
Assets:
Total AFS securities	27,913		25,451
Trading fixed maturities	312		305
Level 2 [Member] | Equity securities [Member]
Assets:
Total AFS securities	207		125
Level 3 [Member]
Assets:
Assets of managed investment entities (MIE)	27		30
Variable annuity assets (separate accounts)	0	[1]	0	[1]
Other investments — derivatives	0		0
Total assets accounted for at fair value	985		891
Liabilities:
Liabilities of managed investment entities	2,322		2,411
Total liabilities accounted for at fair value	3,348		3,215
Level 3 [Member] | Annuity benefits accumulated [Member]
Liabilities:
Derivatives included in annuity benefits accumulated and other liabilities	1,026		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	256		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	204		75
Level 3 [Member] | All other corporate [Member]
Assets:
Total AFS securities	313		335
Level 3 [Member] | Fixed maturities [Member]
Assets:
Total AFS securities	877		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.