Shareholders' Equity (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Changes in Shareholders' Equity [Roll Forward]
Beginning balance	[1]			$ (44)
Net income		$ 746	$ 770	1,958	$ 1,969
Other comprehensive income (loss), net of tax		16	(318)	118	(587)
Ending balance		228		228
Accumulated other comprehensive income (loss), cumulative translation losses		3,001		3,001		$ 3,087
Accumulated other comprehensive income (loss), unrecognized retirement plan and other retiree benefits costs		829		829		$ 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				102
Shares issued for stock options				119
Shares issued for restricted stock units				(57)
Other				52
Ending balance		1,654		1,654
Unearned Compensation
Changes in Shareholders' Equity [Roll Forward]
Beginning balance				(12)
Other				9
Ending balance		(3)		(3)
Treasury Stock
Changes in Shareholders' Equity [Roll Forward]
Beginning balance				(18,102)
Shares issued for stock options				227
Shares issued for restricted stock units				57
Treasury stock acquired				(913)
Ending balance		(18,731)		(18,731)
Retained Earnings
Changes in Shareholders' Equity [Roll Forward]
Beginning balance				18,861
Net income				1,835
Dividends				(1,386)
Ending balance		19,310		19,310
Accumulated Other Comprehensive Income (Loss)
Changes in Shareholders' Equity [Roll Forward]
Beginning balance				(3,950)
Other comprehensive income (loss), net of tax		14	$ (309)	121	$ (578)
Ending balance		(3,829)		(3,829)
Noncontrolling Interests
Changes in Shareholders' Equity [Roll Forward]
Beginning balance				255
Net income				123
Other comprehensive income (loss), net of tax				(3)
Dividends				(14)
Ending balance		$ 361		$ 361

[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.