Investments (Details 3) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014 Holdings	Dec. 31, 2013 Holdings
Indemnity
Fair value
Less than 12 months	$ 52	$ 129
12 months or longer	27	26
Total	79	155
Unrealized losses
Less than 12 months	0	3
12 months or longer	1	0
Total	1	3
No. of holdings	179	38
Indemnity | Investment grade
Fair value
Less than 12 months	11	112
12 months or longer	13	10
Total	24	122
Unrealized losses
Less than 12 months	0	1
12 months or longer	0	0
Total	0	1
No. of holdings	7	32
Indemnity | Non-investment grade
Fair value
Less than 12 months	41	0
12 months or longer	0	0
Total	41	0
Unrealized losses
Less than 12 months	0	0
12 months or longer	0	0
Total	0	0
No. of holdings	169	0
Indemnity | Fixed maturities
Fair value
Less than 12 months	52	112
12 months or longer	13	10
Total	65	122
Unrealized losses
Less than 12 months	0	1
12 months or longer	0	0
Total	0	1
No. of holdings	176	32
Indemnity | States & political subdivisions
Fair value
Less than 12 months	3	58
12 months or longer	7	0
Total	10	58
Unrealized losses
Less than 12 months	0	1
12 months or longer	0	0
Total	0	1
No. of holdings	4	21
Indemnity | Corporate debt securities
Fair value
Less than 12 months	49	54
12 months or longer	6	10
Total	55	64
Unrealized losses
Less than 12 months	0	0
12 months or longer	0	0
Total	0	0
No. of holdings	172	11
Indemnity | Nonredeemable preferred stock
Fair value
Less than 12 months	0	5
12 months or longer	2	3
Total	2	8
Unrealized losses
Less than 12 months	0	1
12 months or longer	0	0
Total	0	1
No. of holdings	2	4
Indemnity | Common stock
Fair value
Less than 12 months	0	12
12 months or longer	12	13
Total	12	25
Unrealized losses
Less than 12 months	0	1
12 months or longer	1	0
Total	1	1
No. of holdings	1	2
Exchange
Fair value
Less than 12 months	412	2,050
12 months or longer	624	176
Total	1,036	2,226
Unrealized losses
Less than 12 months	2	74
12 months or longer	13	5
Total	15	79
No. of holdings	446	388
Exchange | Investment grade
Fair value
Less than 12 months	203	1,707
12 months or longer	429	62
Total	632	1,769
Unrealized losses
Less than 12 months	1	57
12 months or longer	9	4
Total	10	61
No. of holdings	131	344
Exchange | Non-investment grade
Fair value
Less than 12 months	167	64
12 months or longer	24	0
Total	191	64
Unrealized losses
Less than 12 months	1	4
12 months or longer	1	0
Total	2	4
No. of holdings	299	14
Exchange | Fixed maturities
Fair value
Less than 12 months	370	1,771
12 months or longer	453	62
Total	823	1,833
Unrealized losses
Less than 12 months	2	61
12 months or longer	10	4
Total	12	65
No. of holdings	430	358
Exchange | U.S. government & agencies
Fair value
Less than 12 months		1
12 months or longer		0
Total		1
Unrealized losses
Less than 12 months		0
12 months or longer		0
Total		0
No. of holdings		2
Exchange | U.S. treasury
Fair value
Less than 12 months	0
12 months or longer	0
Total	0
Unrealized losses
Less than 12 months	0
12 months or longer	0
Total	0
No. of holdings	1
Exchange | States & political subdivisions
Fair value
Less than 12 months	38	408
12 months or longer	111	18
Total	149	426
Unrealized losses
Less than 12 months	0	13
12 months or longer	2	2
Total	2	15
No. of holdings	36	100
Exchange | Foreign government securities
Fair value
Less than 12 months	0	5
12 months or longer	5	0
Total	5	5
Unrealized losses
Less than 12 months	0	0
12 months or longer	0	0
Total	0	0
No. of holdings	1	1
Exchange | Corporate debt securities
Fair value
Less than 12 months	312	1,251
12 months or longer	279	36
Total	591	1,287
Unrealized losses
Less than 12 months	2	43
12 months or longer	6	2
Total	8	45
No. of holdings	376	237
Exchange | Residential mortgage-backed securities
Fair value
Less than 12 months	15	71
12 months or longer	51	8
Total	66	79
Unrealized losses
Less than 12 months	0	4
12 months or longer	2	0
Total	2	4
No. of holdings	12	12
Exchange | Commercial mortgage-backed securities
Fair value
Less than 12 months	1	5
12 months or longer	0	0
Total	1	5
Unrealized losses
Less than 12 months	0	0
12 months or longer	0	0
Total	0	0
No. of holdings	1	1
Exchange | Other debt securities
Fair value
Less than 12 months	4	30
12 months or longer	7	0
Total	11	30
Unrealized losses
Less than 12 months	0	1
12 months or longer	0	0
Total	0	1
No. of holdings	3	5
Exchange | Nonredeemable preferred stock
Fair value
Less than 12 months	42	182
12 months or longer	40	13
Total	82	195
Unrealized losses
Less than 12 months	0	10
12 months or longer	2	1
Total	2	11
No. of holdings	14	27
Exchange | Common stock
Fair value
Less than 12 months	0	97
12 months or longer	131	101
Total	131	198
Unrealized losses
Less than 12 months	0	3
12 months or longer	1	0
Total	$ 1	$ 3
No. of holdings	2	3