CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (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
Tax expense of actuarial gains	$ (91)	$ 15	$ (58)	$ 64
Tax benefit of prior service costs	$ (13)	$ 0	$ (43)	$ (3)