Shareholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			$ 1,385
Net income	$ 770	$ 580	1,969	$ 1,673
Other comprehensive income (loss), net of tax	(318)	$ (385)	(587)	$ (439)
Ending balance	590		590
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	3,079		3,079		$ 2,453
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	1,012		1,012		$ 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			104
Shares issued for stock options			74
Shares issued for restricted stock units			(66)
Other			3
Ending balance	1,351		1,351
Unearned Compensation [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			(20)
Other			12
Ending balance	(8)		(8)
Treasury Stock [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			(16,862)
Shares issued for stock options			200
Shares issued for restricted stock units			66
Treasury stock acquired			(1,196)
Ending balance	(17,792)		(17,792)
Retained Earnings [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			18,832
Net income			1,842
Dividends			(1,351)
Ending balance	19,323		19,323
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			(3,507)
Other comprehensive income (loss), net of tax			(578)
Ending balance	(4,085)		(4,085)
Noncontrolling Interests [Member]
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			240
Net income			127
Other comprehensive income (loss), net of tax			(9)
Dividends			(23)
Ending balance	$ 335		$ 335