Investments (EITF info) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014 item	Dec. 31, 2013 item
Number of Securities
Less than 12 months (number of positions)	40	279
12 months or more (number of positions)	146	63
Total (number of positions)	186	342
Fair Value
Less than 12 months	$ 302	$ 4,635
12 months or more	1,932	595
Total	2,234	5,230
Unrealized Losses
Less than 12 months (unrealized losses position)	(2)	(159)
12 months or more (unrealized losses position)	(104)	(95)
Total (unrealized losses position)	(106)	(254)
Corporate Debt Securities [Member]
Number of Securities
Less than 12 months (number of positions)	18	156
12 months or more (number of positions)	51	10
Total (number of positions)	69	166
Fair Value
Less than 12 months	157	2,567
12 months or more	789	160
Total	946	2,727
Unrealized Losses
Less than 12 months (unrealized losses position)	(1)	(82)
12 months or more (unrealized losses position)	(18)	(14)
Total (unrealized losses position)	(19)	(96)
Residential Mortgage Backed Securities [Member]
Number of Securities
Less than 12 months (number of positions)	15	52
12 months or more (number of positions)	63	45
Total (number of positions)	78	97
Fair Value
Less than 12 months	122	1,411
12 months or more	845	295
Total	967	1,706
Unrealized Losses
Less than 12 months (unrealized losses position)	(1)	(54)
12 months or more (unrealized losses position)	(49)	(41)
Total (unrealized losses position)	(50)	(95)
Commercial Mortgage Backed Securities [Member]
Number of Securities
Less than 12 months (number of positions)	4	27
12 months or more (number of positions)	9	3
Total (number of positions)	13	30
Fair Value
Less than 12 months	3	323
12 months or more	96	22
Total	99	345
Unrealized Losses
Less than 12 months (unrealized losses position)	0	(9)
12 months or more (unrealized losses position)	(4)	(2)
Total (unrealized losses position)	(4)	(11)
State and municipal obligations
Number of Securities
Less than 12 months (number of positions)	0	4
12 months or more (number of positions)	2	2
Total (number of positions)	2	6
Fair Value
Less than 12 months	0	38
12 months or more	101	92
Total	101	130
Unrealized Losses
Less than 12 months (unrealized losses position)	0	(2)
12 months or more (unrealized losses position)	(28)	(37)
Total (unrealized losses position)	(28)	(39)
Asset backed securities
Number of Securities
Less than 12 months (number of positions)	0	17
12 months or more (number of positions)	7	3
Total (number of positions)	7	20
Fair Value
Less than 12 months	0	219
12 months or more	74	26
Total	74	245
Unrealized Losses
Less than 12 months (unrealized losses position)	0	(4)
12 months or more (unrealized losses position)	(1)	(1)
Total (unrealized losses position)	(1)	(5)
Foreign government bonds and obligations
Number of Securities
Less than 12 months (number of positions)	3	23
12 months or more (number of positions)	14	0
Total (number of positions)	17	23
Fair Value
Less than 12 months	20	77
12 months or more	27	0
Total	47	77
Unrealized Losses
Less than 12 months (unrealized losses position)	0	(8)
12 months or more (unrealized losses position)	(4)	0
Total (unrealized losses position)	$ (4)	$ (8)