Investments and Cash - Fixed Maturity Securities Gross Unrealized Loss by Length of Time (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014 Security		Dec. 31, 2013 Security
Less than 12 months
Fair value	$ 861		$ 2,140
Unrealized loss	(18)		(91)
12 months or more
Fair Value	651		237
Unrealized loss	(47)		(56)
Total
Total Fair value	1,512		2,377
Total Unrealized loss	(65)		(147)
Number of securities
Less than 12 months (in securities)	143	[1]	425
12 months or more (in securities)	123	[1]	33
Total (in securities)	260	[1]	458
Number of securities with OTTI
Less than 12 months (in securities)	4		13
12 months or more (in securities)	7		11
Total (in securities)	11		24
Number of securities with unrealized losses greater than 10% of book value for 12 months or more	7
Threshold for measuring unrealized losses for securities as a percent of book value	10.00%
Total unrealized losses for securities having losses greater than 10% of book value for 12 months or more	31
Obligations of state and political subdivisions
Less than 12 months
Fair value	93		781
Unrealized loss	(1)		(39)
12 months or more
Fair Value	72		5
Unrealized loss	(1)		0
Total
Total Fair value	165		786
Total Unrealized loss	(2)		(39)
U.S. government and agencies
Less than 12 months
Fair value	28		173
Unrealized loss	0		(6)
12 months or more
Fair Value	162		0
Unrealized loss	(3)		0
Total
Total Fair value	190		173
Total Unrealized loss	(3)		(6)
Corporate securities
Less than 12 months
Fair value	247		401
Unrealized loss	(13)		(18)
12 months or more
Fair Value	127		3
Unrealized loss	(5)		0
Total
Total Fair value	374		404
Total Unrealized loss	(18)		(18)
RMBS
Less than 12 months
Fair value	312		414
Unrealized loss	(3)		(21)
12 months or more
Fair Value	226		186
Unrealized loss	(36)		(51)
Total
Total Fair value	538		600
Total Unrealized loss	(39)		(72)
CMBS
Less than 12 months
Fair value	82		121
Unrealized loss	0		(4)
12 months or more
Fair Value	26		0
Unrealized loss	(1)		0
Total
Total Fair value	108		121
Total Unrealized loss	(1)		(4)
Asset-backed securities
Less than 12 months
Fair value	39		196
Unrealized loss	0		(2)
12 months or more
Fair Value	19		42
Unrealized loss	(1)		(5)
Total
Total Fair value	58		238
Total Unrealized loss	(1)		(7)
Foreign government securities
Less than 12 months
Fair value	60		54
Unrealized loss	(1)		(1)
12 months or more
Fair Value	19		1
Unrealized loss	0		0
Total
Total Fair value	79		55
Total Unrealized loss	$ (1)		$ (1)

[1] The number of securities does not add across because of lots of the same securities that have been purchased at different times and appear in both categories above (i.e. Less than 12 months and 12 months or more). If a security appears in both categories, it is counted only once in the Total column.