Investments (Details 1) (USD $) In Millions, unless otherwise specified	Jun. 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	$ (2)	$ (3)
Fair Value - Less than twelve months	18	60
Fair Value as % of Cost - Less than twelve months	90.00%	95.00%
Unrealized Loss - Twelve months or more	0	0
Fair Value - Twelve months or more	1	0
Fair Value as % of Cost - Twelve months or more	100.00%	0.00%
States, municipalities and political subdivisions [Member]
Available for sale securities in a continuous unrealized loss position
Unrealized Loss - Less than twelve months	(3)	(135)
Fair Value - Less than twelve months	289	2,219
Fair Value as % of Cost - Less than twelve months	99.00%	94.00%
Unrealized Loss - Twelve months or more	(29)	(9)
Fair Value - Twelve months or more	933	73
Fair Value as % of Cost - Twelve months or more	97.00%	89.00%
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	304	553
Fair Value as % of Cost - Less than twelve months	99.00%	98.00%
Unrealized Loss - Twelve months or more	(14)	(19)
Fair Value - Twelve months or more	260	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	(1)	(3)
Fair Value - Less than twelve months	24	106
Fair Value as % of Cost - Less than twelve months	96.00%	97.00%
Unrealized Loss - Twelve months or more	0	0
Fair Value - Twelve months or more	17	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	(5)	(18)
Fair Value - Less than twelve months	990	1,310
Fair Value as % of Cost - Less than twelve months	99.00%	99.00%
Unrealized Loss - Twelve months or more	(6)	(1)
Fair Value - Twelve months or more	332	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	(4)	(101)
Fair Value - Less than twelve months	238	2,634
Fair Value as % of Cost - Less than twelve months	98.00%	96.00%
Unrealized Loss - Twelve months or more	(17)	(7)
Fair Value - Twelve months or more	772	85
Fair Value as % of Cost - Twelve months or more	98.00%	92.00%
Fixed maturities [Member]
Available for sale securities in a continuous unrealized loss position
Unrealized Loss - Less than twelve months	(19)	(269)
Fair Value - Less than twelve months	1,863	6,882
Fair Value as % of Cost - Less than twelve months	99.00%	96.00%
Unrealized Loss - Twelve months or more	(66)	(36)
Fair Value - Twelve months or more	2,315	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	(15)	(16)
Fair Value - Less than twelve months	98	158
Fair Value as % of Cost - Less than twelve months	87.00%	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	16	91
Fair Value as % of Cost - Less than twelve months	94.00%	94.00%
Unrealized Loss - Twelve months or more	(3)	(4)
Fair Value - Twelve months or more	$ 52	$ 20
Fair Value as % of Cost - Twelve months or more	95.00%	83.00%