Consolidated Statement of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Statement of Other Comprehensive Income [Abstract]
Foreign currency translation, net of tax (expense)/benefit	$ 11	$ (69)	$ (5)	$ 15
Current year actuarial gain (loss), net of tax (expense)/benefit	91	0	83	0
Amortization of actuarial (gain) loss, net of tax (expense)/benefit	(61)	(46)	(181)	(158)
Current year prior service credit (cost), net of tax (expense)/benefit	(3)	0	(1)	0
Amortization of prior service (credit) cost, net of tax (expense)/benefit	4	3	12	9
Amortization of transition (asset) obligation, net of tax (expense)/benefit	0	(1)	0	(1)
Derivative financial instruments, Gains (losses) deferred, net of tax (expense)/benefit	5	(21)	21	(15)
Derivative financial instruments, (Gains) losses reclassified to earnings, net of tax (expense)/benefit	(5)	14	(6)	14
Available-for-sale securities, Gains (losses) deferred, net of tax (expense)/benefit	(8)	13	(13)	8
Available-for-sale securities, (Gains) losses reclassified to earnings, net of tax (expense)/benefit	$ 0	$ 0	$ 0	$ 0