Shareholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			$ 1,385
Net income	$ 616	$ 661	1,199	$ 1,093
Other comprehensive income (loss), net of tax	70	$ 33	(269)	$ (54)
Ending balance	757		757
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	2,738		2,738		$ 2,453
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	1,037		1,037		$ 1,064
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			1,236
Stock-based compensation expense			51
Shares issued for stock options			50
Shares issued for restricted stock units			(31)
Other			4
Ending balance	1,310		1,310
Unearned Compensation [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			(20)
Other			11
Ending balance	(9)		(9)
Treasury Stock [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			(16,862)
Shares issued for stock options			125
Shares issued for restricted stock units			31
Treasury stock acquired			(767)
Ending balance	(17,473)		(17,473)
Retained Earnings [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			18,832
Net income			1,116
Dividends			(1,012)
Ending balance	18,936		18,936
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			(3,507)
Other comprehensive income (loss), net of tax			(269)
Ending balance	(3,776)		(3,776)
Noncontrolling Interests [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			240
Net income			$ 83
Other comprehensive income (loss), net of tax
Dividends			$ (20)
Ending balance	$ 303		$ 303