Investments and Cash - Fixed Maturity Securities Gross Unrealized Loss by Length of Time (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014 Security	Dec. 31, 2013 Security
Less than 12 months
Fair value	$ 324	$ 2,140
Unrealized loss	(20)	(91)
12 months or more
Fair Value	946	237
Unrealized loss	(59)	(56)
Total
Total Fair value	1,270	2,377
Total Unrealized loss	(79)	(147)
Number of securities
Less than 12 months (in securities)	58	425
12 months or more (in securities)	165	33
Total (in securities)	223	458
Number of securities with OTTI
Less than 12 months (in securities)	2	13
12 months or more (in securities)	11	11
Total (in securities)	13	24
Number of securities with unrealized losses greater than 10% of book value for 12 months or more	9
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	34
U.S. government and agencies
Less than 12 months
Fair value	7	173
Unrealized loss	0	(6)
12 months or more
Fair Value	172	0
Unrealized loss	(3)	0
Total
Total Fair value	179	173
Total Unrealized loss	(3)	(6)
Obligations of state and political subdivisions
Less than 12 months
Fair value	53	781
Unrealized loss	(1)	(39)
12 months or more
Fair Value	217	5
Unrealized loss	(4)	0
Total
Total Fair value	270	786
Total Unrealized loss	(5)	(39)
Corporate securities
Less than 12 months
Fair value	122	401
Unrealized loss	(17)	(18)
12 months or more
Fair Value	156	3
Unrealized loss	(5)	0
Total
Total Fair value	278	404
Total Unrealized loss	(22)	(18)
RMBS
Less than 12 months
Fair value	89	414
Unrealized loss	(2)	(21)
12 months or more
Fair Value	317	186
Unrealized loss	(43)	(51)
Total
Total Fair value	406	600
Total Unrealized loss	(45)	(72)
CMBS
Less than 12 months
Fair value	0	121
Unrealized loss	0	(4)
12 months or more
Fair Value	26	0
Unrealized loss	0	0
Total
Total Fair value	26	121
Total Unrealized loss	0	(4)
Asset-backed securities
Less than 12 months
Fair value	9	196
Unrealized loss	0	(2)
12 months or more
Fair Value	48	42
Unrealized loss	(3)	(5)
Total
Total Fair value	57	238
Total Unrealized loss	(3)	(7)
Foreign government securities
Less than 12 months
Fair value	44	54
Unrealized loss	0	(1)
12 months or more
Fair Value	10	1
Unrealized loss	(1)	0
Total
Total Fair value	54	55
Total Unrealized loss	$ (1)	$ (1)