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	$ 682	$ 537	$ 555
Other comprehensive income (loss), net of tax -
Unrecognized amounts on retirement benefits, net of tax of $1, $(2) and $(1)	3	(3)	(2)
Comprehensive income	$ 685	$ 534	$ 553