Shareholder's Equity (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Amounts Reclassified from AOCI
Net realized investment gains (losses)	$ 1	$ (1)	$ 5	$ (2)
Net investment income	323	359	656	717
Income tax provision	49	30	87	84
Net income	243	186	541	426
Net unrealized (gains) losses on Available-for-Sale securities | Amount Reclassified from AOCI
Amounts Reclassified from AOCI
Net realized investment gains (losses)	(1)	0	(5)	1
Income tax provision	1	1	2	0
Net income	0	1	(3)	1
Losses on cash flow hedges | Amount Reclassified from AOCI
Amounts Reclassified from AOCI
Net investment income	1	2	3	4
Income tax provision	0	0	(1)	(1)
Net income	$ 1	$ 2	$ 2	$ 3