Shareholders' Equity (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Changes in Shareholders' Equity [Roll Forward]
Beginning balance	[1]			$ (44)
Net income		$ 638	$ 616	1,212	$ 1,199
Other comprehensive income (loss), net of tax		(24)	70	102	(269)
Ending balance		34		34
Accumulated other comprehensive income (loss), cumulative translation losses		2,999		2,999		$ 3,087
Accumulated other comprehensive income (loss), unrecognized retirement plan and other retiree benefits costs		845		845		$ 868
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				1,438
Stock-based compensation expense				48
Shares issued for stock options				76
Shares issued for restricted stock units				(26)
Other				6
Ending balance		1,542		1,542
Unearned Compensation
Changes in Shareholders' Equity [Roll Forward]
Beginning balance				(12)
Other				7
Ending balance		(5)		(5)
Treasury Stock
Changes in Shareholders' Equity [Roll Forward]
Beginning balance				(18,102)
Shares issued for stock options				160
Shares issued for restricted stock units				26
Treasury stock acquired				(482)
Other				2
Ending balance		(18,396)		(18,396)
Retained Earnings
Changes in Shareholders' Equity [Roll Forward]
Beginning balance				18,861
Net income				1,133
Dividends				(1,039)
Ending balance		18,955		18,955
Accumulated Other Comprehensive Income (Loss)
Changes in Shareholders' Equity [Roll Forward]
Beginning balance				(3,950)
Other comprehensive income (loss), net of tax		(18)	$ 71	107	$ (269)
Ending balance		(3,843)		(3,843)
Noncontrolling Interests
Changes in Shareholders' Equity [Roll Forward]
Beginning balance				255
Net income				79
Other comprehensive income (loss), net of tax				(5)
Dividends				(14)
Ending balance		$ 315		$ 315

[1] Prior year amounts have been reclassified to conform to the current year presentation of debt issuance costs required by Accounting Standards Update (“ASU”) No. 2015-03 “Simplifying the Presentation of Debt Issuance Costs.” See Note 1 to the Condensed Consolidated Financial Statements for additional information.