Investments (AFS by type) (Details) (USD $)	Jun. 30, 2014		Dec. 31, 2013
Investments
Amortized Cost	$ 22,046,000,000		$ 22,904,000,000
Available for Sale Securities Gross Unrealized Gain Accumulated in Investments	2,243,000,000		1,743,000,000
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	(106,000,000)		(254,000,000)
Fair Value	24,183,000,000		24,393,000,000
Noncredit OTTI	(6,000,000)	[1]	(13,000,000)	[1]
Security Owned and Pledged as Collateral, Fair Value	1,900,000,000		2,300,000,000
Corporate Debt Securities [Member]
Investments
Amortized Cost	14,019,000,000		14,658,000,000
Available for Sale Securities Gross Unrealized Gain Accumulated in Investments	1,696,000,000		1,311,000,000
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	(19,000,000)		(96,000,000)
Fair Value	15,696,000,000		15,873,000,000
Noncredit OTTI	3,000,000	[1]	3,000,000	[1]
Residential Mortgage Backed Securities [Member]
Investments
Amortized Cost	3,652,000,000		3,773,000,000
Available for Sale Securities Gross Unrealized Gain Accumulated in Investments	158,000,000		133,000,000
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	(50,000,000)		(95,000,000)
Fair Value	3,760,000,000		3,811,000,000
Noncredit OTTI	(12,000,000)	[1]	(18,000,000)	[1]
Commercial Mortgage Backed Securities [Member]
Investments
Amortized Cost	2,222,000,000		2,309,000,000
Available for Sale Securities Gross Unrealized Gain Accumulated in Investments	140,000,000		136,000,000
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	(4,000,000)		(11,000,000)
Fair Value	2,358,000,000		2,434,000,000
State and municipal obligations
Investments
Amortized Cost	942,000,000		950,000,000
Available for Sale Securities Gross Unrealized Gain Accumulated in Investments	160,000,000		87,000,000
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	(28,000,000)		(39,000,000)
Fair Value	1,074,000,000		998,000,000
Asset backed securities
Investments
Amortized Cost	935,000,000		938,000,000
Available for Sale Securities Gross Unrealized Gain Accumulated in Investments	55,000,000		48,000,000
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	(1,000,000)		(5,000,000)
Fair Value	989,000,000		981,000,000
Foreign government bonds and obligations
Investments
Amortized Cost	238,000,000		234,000,000
Available for Sale Securities Gross Unrealized Gain Accumulated in Investments	24,000,000		19,000,000
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	(4,000,000)		(8,000,000)
Fair Value	258,000,000		245,000,000
U.S. government and agencies obligations
Investments
Amortized Cost	36,000,000		40,000,000
Available for Sale Securities Gross Unrealized Gain Accumulated in Investments	4,000,000		5,000,000
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	0		0
Fair Value	40,000,000		45,000,000
Total fixed maturities
Investments
Amortized Cost	22,044,000,000		22,902,000,000
Available for Sale Securities Gross Unrealized Gain Accumulated in Investments	2,237,000,000		1,739,000,000
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	(106,000,000)		(254,000,000)
Fair Value	24,175,000,000		24,387,000,000
Noncredit OTTI	(9,000,000)	[1]	(15,000,000)	[1]
Common Stock [Member]
Investments
Amortized Cost	2,000,000		2,000,000
Available for Sale Securities Gross Unrealized Gain Accumulated in Investments	6,000,000		4,000,000
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	0		0
Fair Value	8,000,000		6,000,000
Noncredit OTTI	$ 3,000,000	[1]	$ 2,000,000	[1]

[1] Represents the amount of other-than-temporary impairment (“OTTI”) losses in accumulated other comprehensive income. Amount includes unrealized gains and losses on impaired securities subsequent to the initial impairment measurement date. These amounts are included in gross unrealized gains and losses as of the end of the period.