Shareholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Changes in Shareholders' Equity [Roll Forward]
Beginning balance	$ 17
Net income	611	$ 574
Other comprehensive income (loss), net of tax	135	126
Ending balance	(5)
Accumulated other comprehensive income (loss), cumulative translation losses	3,087		$ 3,212
Accumulated other comprehensive income (loss), unrecognized retirement plan and other retiree benefits costs	964		$ 977
Common Stock
Changes in Shareholders' Equity [Roll Forward]
Beginning balance	1,466
Ending balance	1,466
Additional Paid-in Capital
Changes in Shareholders' Equity [Roll Forward]
Beginning balance	1,691
Stock-based compensation expense	35
Shares issued for stock options	88
Shares issued for restricted stock awards	(29)
Other	2
Ending balance	1,787
Unearned Compensation
Changes in Shareholders' Equity [Roll Forward]
Beginning balance	(7)
Other	4
Ending balance	(3)
Treasury Stock
Changes in Shareholders' Equity [Roll Forward]
Beginning balance	(19,135)
Shares issued for stock options	146
Shares issued for restricted stock awards	29
Treasury stock acquired	(333)
Ending balance	(19,293)
Retained Earnings
Changes in Shareholders' Equity [Roll Forward]
Beginning balance	19,922
Net income	570
Dividends	(699)
Other	(11)
Ending balance	19,782
Accumulated Other Comprehensive Income (Loss)
Changes in Shareholders' Equity [Roll Forward]
Beginning balance	(4,180)
Other comprehensive income (loss), net of tax	128	$ 125
Ending balance	(4,052)
Noncontrolling Interests
Changes in Shareholders' Equity [Roll Forward]
Beginning balance	260
Net income	41
Other comprehensive income (loss), net of tax	7
Ending balance	$ 308