Investments (Details 1) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
U.S. Government and government agencies [Member]
Available for sale securities in a continuous unrealized loss position
Unrealized Loss - Less than twelve months	$ 0	$ (3)
Fair Value - Less than twelve months	22	60
Fair Value as % of Cost - Less than twelve months	100.00%	95.00%
Unrealized Loss - Twelve months or more	(2)	0
Fair Value - Twelve months or more	15	0
Fair Value as % of Cost - Twelve months or more	88.00%	0.00%
States, municipalities and political subdivisions [Member]
Available for sale securities in a continuous unrealized loss position
Unrealized Loss - Less than twelve months	(7)	(135)
Fair Value - Less than twelve months	617	2,219
Fair Value as % of Cost - Less than twelve months	99.00%	94.00%
Unrealized Loss - Twelve months or more	(20)	(9)
Fair Value - Twelve months or more	566	73
Fair Value as % of Cost - Twelve months or more	97.00%	89.00%
Foreign government [Member]
Available for sale securities in a continuous unrealized loss position
Unrealized Loss - Less than twelve months	0
Fair Value - Less than twelve months	84
Fair Value as % of Cost - Less than twelve months	100.00%
Unrealized Loss - Twelve months or more	0
Fair Value - Twelve months or more	0
Fair Value as % of Cost - Twelve months or more	0.00%
Residential Mortgage Backed Securities [Member]
Available for sale securities in a continuous unrealized loss position
Unrealized Loss - Less than twelve months	(4)	(9)
Fair Value - Less than twelve months	330	553
Fair Value as % of Cost - Less than twelve months	99.00%	98.00%
Unrealized Loss - Twelve months or more	(12)	(19)
Fair Value - Twelve months or more	225	212
Fair Value as % of Cost - Twelve months or more	95.00%	92.00%
Commercial Mortgage Backed Securities [Member]
Available for sale securities in a continuous unrealized loss position
Unrealized Loss - Less than twelve months	0	(3)
Fair Value - Less than twelve months	44	106
Fair Value as % of Cost - Less than twelve months	100.00%	97.00%
Unrealized Loss - Twelve months or more	0	0
Fair Value - Twelve months or more	11	2
Fair Value as % of Cost - Twelve months or more	100.00%	100.00%
Asset-backed Securities [Member]
Available for sale securities in a continuous unrealized loss position
Unrealized Loss - Less than twelve months	(10)	(18)
Fair Value - Less than twelve months	1,490	1,310
Fair Value as % of Cost - Less than twelve months	99.00%	99.00%
Unrealized Loss - Twelve months or more	(9)	(1)
Fair Value - Twelve months or more	485	28
Fair Value as % of Cost - Twelve months or more	98.00%	97.00%
All other corporate [Member]
Available for sale securities in a continuous unrealized loss position
Unrealized Loss - Less than twelve months	(13)	(101)
Fair Value - Less than twelve months	1,277	2,634
Fair Value as % of Cost - Less than twelve months	99.00%	96.00%
Unrealized Loss - Twelve months or more	(18)	(7)
Fair Value - Twelve months or more	580	85
Fair Value as % of Cost - Twelve months or more	97.00%	92.00%
Fixed maturities [Member]
Available for sale securities in a continuous unrealized loss position
Unrealized Loss - Less than twelve months	(34)	(269)
Fair Value - Less than twelve months	3,864	6,882
Fair Value as % of Cost - Less than twelve months	99.00%	96.00%
Unrealized Loss - Twelve months or more	(61)	(36)
Fair Value - Twelve months or more	1,882	400
Fair Value as % of Cost - Twelve months or more	97.00%	92.00%
Common stocks [Member]
Available for sale securities in a continuous unrealized loss position
Unrealized Loss - Less than twelve months	(36)	(16)
Fair Value - Less than twelve months	278	158
Fair Value as % of Cost - Less than twelve months	89.00%	91.00%
Unrealized Loss - Twelve months or more	0	0
Fair Value - Twelve months or more	0	0
Fair Value as % of Cost - Twelve months or more	0.00%	0.00%
Perpetual preferred stocks [Member]
Available for sale securities in a continuous unrealized loss position
Unrealized Loss - Less than twelve months	(1)	(6)
Fair Value - Less than twelve months	61	91
Fair Value as % of Cost - Less than twelve months	98.00%	94.00%
Unrealized Loss - Twelve months or more	(3)	(4)
Fair Value - Twelve months or more	$ 57	$ 20
Fair Value as % of Cost - Twelve months or more	95.00%	83.00%