Shareholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			$ 17
Net income	$ 560	$ 638	1,171	$ 1,212
Other comprehensive income (loss), net of tax	107	(24)	242	102
Ending balance	88		88
Accumulated other comprehensive income (loss), cumulative translation losses	2,991		2,991		$ 3,212
Accumulated other comprehensive income (loss), unrecognized retirement plan and other retiree benefits costs	952		952		$ 977
Common Stock
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			1,466
Ending balance	1,466		1,466
Additional Paid-in Capital
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			1,691
Stock-based compensation expense			53
Shares issued for stock options			126
Shares issued for restricted stock units			(17)
Other			1
Ending balance	1,854		1,854
Unearned Compensation
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			(7)
Other			5
Ending balance	(2)		(2)
Treasury Stock
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			(19,135)
Shares issued for stock options			208
Shares issued for restricted stock units			17
Treasury stock acquired			(660)
Other			5
Ending balance	(19,565)		(19,565)
Retained Earnings
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			19,922
Net income			1,094
Dividends			(1,053)
Other			(11)
Ending balance	19,952		19,952
Accumulated Other Comprehensive Income (Loss)
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			(4,180)
Other comprehensive income (loss), net of tax	105	$ (18)	233	$ 107
Ending balance	(3,947)		(3,947)
Noncontrolling Interests
Changes in Shareholders' Equity [Roll Forward]
Beginning balance			260
Net income			77
Other comprehensive income (loss), net of tax			9
Dividends			(16)
Ending balance	$ 330		$ 330