Shareholders' Equity (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			$ 2,390
Net income	604	665	1,110	1,298
Other comprehensive income, net of tax	(171)	(291)	(208)	(83)
Ending balance	1,804		1,804
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	1,860		1,860		1,609
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	1,015		1,015		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			52
Shares issued for stock options			40
Stock issued for restricted stock awards			(47)
Other			1
Ending balance	864		864
Unearned Compensation [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			(41)
Other			3
Ending balance	(38)		(38)
Treasury Stock [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			(14,386)
Shares issued for stock options			123
Stock issued for restricted stock awards			47
Treasury stock acquired			(771)
Other			(1)
Ending balance	(14,988)		(14,988)
Retained Earnings [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			16,953
Net income			1,021
Dividends			(922)
Ending balance	17,052		17,052
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			(2,621)
Other comprehensive income, net of tax			(204)
Ending balance	(2,825)		(2,825)
Noncontrolling Interests [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			201
Net income			89
Other comprehensive income, net of tax			(4)
Dividends			(18)
Other			5
Ending balance	$ 273		$ 273