Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net Income	$ 90	$ 127	$ 206	$ 224
Benefit Obligations Net Of Tax	1	1	1	2
Other comprehensive income (loss), net of tax:
Comprehensive income	$ 91	$ 128	$ 207	$ 226