Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income	$ 1,224	$ 1,133	$ 2,634	$ 2,464
Other comprehensive income:
Actuarial changes, net of tax of ($5), ($3), $28 and $20	(9)	(5)	46	31
Prior service costs, net of tax of $10, $1, $207 and $2	17	1	344	3
Other, net of tax of $-, $-, $- and $-		(1)		(1)
Other comprehensive income (loss)	8	(5)	390	33
Comprehensive income	$ 1,232	$ 1,128	$ 3,024	$ 2,497