Shareholders' Equity (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Changes in Shareholders' Equity [Roll Forward]
Beginning balance	$ 2,536
Net income	432	506
Other comprehensive income, net of tax	(87)	(37)
Ending balance	1,900
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	1,815		1,772
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	722		735
Common Stock [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			1,466
Ending balance	1,466		1,466
Additional Paid-In Capital [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance	1,004
Stock-based compensation expense	34
Shares issued for stock options	9
Stock issued for restricted stock awards	(40)
Other	3
Ending balance	1,010
Unearned Compensation [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance	(33)
Other	7
Ending balance	(26)
Treasury Stock [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance	(15,633)
Shares issued for stock options	65
Stock issued for restricted stock awards	40
Treasury stock acquired	(453)
Other
Ending balance	(15,981)
Retained Earnings [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance	17,952
Net income	388
Dividends	(642)
Ending balance	17,698
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance	(2,451)
Other comprehensive income, net of tax	(86)
Ending balance	(2,537)
Noncontrolling Interests [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance	231
Net income	44
Other comprehensive income, net of tax	(1)
Dividends	(4)
Ending balance	$ 270