Shareholders' Equity (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			$ 2,390
Net income	699	697	1,809	1,995
Other comprehensive income, net of tax	106	107	(102)	24
Ending balance	2,007		2,007
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	1,767		1,767		1,609
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	997		997		1,053
Common Stock [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance					1,466
Ending balance	1,466		1,466		1,466
Additional Paid-In Capital [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			818
Stock-based compensation expense			105
Shares issued for stock options			64
Stock issued for restricted stock awards			(72)
Other			(3)
Ending balance	912		912
Unearned Compensation [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			(41)
Other			6
Ending balance	(35)		(35)
Treasury Stock [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			(14,386)
Shares issued for stock options			195
Stock issued for restricted stock awards			72
Treasury stock acquired			(1,115)
Other			(2)
Ending balance	(15,236)		(15,236)
Retained Earnings [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			16,953
Net income			1,677
Dividends			(1,237)
Ending balance	17,393		17,393
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			(2,621)
Other comprehensive income, net of tax			(95)
Ending balance	(2,716)		(2,716)
Noncontrolling Interests [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			201
Net income			132
Other comprehensive income, net of tax			(7)
Dividends			(108)
Other			5
Ending balance	$ 223		$ 223