Investments (Details 6) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment (“OTTI”) losses	$ (144)	$ (54)	$ (49)
OTTI losses reclassified to (from) other comprehensive income	16	(1)	(3)
Net OTTI losses recognized in earnings	(128)	(55)	(52)
Fixed income securities
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment (“OTTI”) losses	(42)	(9)	(42)
OTTI losses reclassified to (from) other comprehensive income	16	(1)	(3)
Net OTTI losses recognized in earnings	(26)	(10)	(45)
Municipal
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment (“OTTI”) losses	0	(1)	(8)
OTTI losses reclassified to (from) other comprehensive income	0	0	0
Net OTTI losses recognized in earnings	0	(1)	(8)
Corporate
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment (“OTTI”) losses	(25)	(4)	0
OTTI losses reclassified to (from) other comprehensive income	6	0	0
Net OTTI losses recognized in earnings	(19)	(4)	0
ABS
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment (“OTTI”) losses	(16)	(5)	0
OTTI losses reclassified to (from) other comprehensive income	10	0	(2)
Net OTTI losses recognized in earnings	(6)	(5)	(2)
RMBS
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment (“OTTI”) losses	0	2	(2)
OTTI losses reclassified to (from) other comprehensive income	0	(1)	2
Net OTTI losses recognized in earnings	0	1	0
CMBS
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment (“OTTI”) losses	(1)	(1)	(32)
OTTI losses reclassified to (from) other comprehensive income	0	0	(3)
Net OTTI losses recognized in earnings	(1)	(1)	(35)
Mortgage loans
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment (“OTTI”) losses	4	5	11
OTTI losses reclassified to (from) other comprehensive income	0	0	0
Net OTTI losses recognized in earnings	4	5	11
Equity securities
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment (“OTTI”) losses	(83)	(32)	(6)
OTTI losses reclassified to (from) other comprehensive income	0	0	0
Net OTTI losses recognized in earnings	(83)	(32)	(6)
Limited partnership interests
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment (“OTTI”) losses	(17)	(18)	(9)
OTTI losses reclassified to (from) other comprehensive income	0	0	0
Net OTTI losses recognized in earnings	(17)	(18)	(9)
Other
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment (“OTTI”) losses	(6)	0	(3)
OTTI losses reclassified to (from) other comprehensive income	0	0	0
Net OTTI losses recognized in earnings	$ (6)	$ 0	$ (3)