Shareholders' Equity Table (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Amounts Reclassified from AOCI
Net investment income	$ 423	$ 433	$ 907	$ 904
Income tax provision	139	152	278	286
Interest and debt expense	89	79	173	158
Income (loss) from continuing operations before income taxes	615	619	1,233	1,269
Net unrealized (gains) losses on available-for-sale securities [Member] | Amount reclassified from AOCI [Member]
Amounts Reclassified from AOCI
Net investment income	(5)	(1)	(16)	(6)
Income tax provision	2	0	6	2
Net of tax	(3)	(1)	(10)	(4)
Losses (gains) on cash flow hedges [Member] | Amount reclassified from AOCI [Member]
Amounts Reclassified from AOCI
Income tax provision	0	0	0	0
Net of tax	0	0	0	0
Income (loss) from continuing operations before income taxes	0	0	0	0
Losses (gains) on cash flow hedges [Member] | Amount reclassified from AOCI [Member] | Interest rate contracts [Member]
Amounts Reclassified from AOCI
Interest and debt expense	(1)	(1)	(2)	(2)
Losses (gains) on cash flow hedges [Member] | Amount reclassified from AOCI [Member] | Swaptions [Member]
Amounts Reclassified from AOCI
Net investment income	$ 1	$ 1	$ 2	$ 2