CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Tax expense of actuarial gains	$ 18	$ 26	$ 33	$ 49
Tax benefit of prior service costs	$ (13)	$ (3)	$ (30)	$ (3)