Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net Income	$ 487	$ 486	$ 437
Other comprehensive income (loss), net of tax:
Benefit obligations, net of tax of $4, $(1) and $2	5	(2)	(4)
Net unrealized gains on investments during the period, net of taxes of $—, $— and $—	1	0	0
Other Comprehensive Income (Loss), Net of Tax	6	(2)	(4)
Comprehensive income	$ 493	$ 484	$ 433