Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Change in amortization of accumulated actuarial losses and prior service costs, net of tax benefit	$ 0	$ (2)	$ 0	$ (6)