Nature of Operations, Basis of Presentation and Change in Accounting Principle (Details 2) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Jan. 01, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Results of Operations
Cost of goods sold		$ 6,758	$ 6,822
Selling, general and administrative expenses		1,045	1,088
Research and development expenses		418	508
Other operating (income) expenses		1,025	397
Total operating costs		9,405	8,967
Operating profit		417	494
Other income (expense)		(5)	0
Consolidated profit before taxes		289	365
Provision (benefit) for income taxes		90	92
Profit of consolidated companies		199	273
Profit of consolidated and affiliated companies		194	272
Profit	[1]	$ 192	$ 271
Profit per common share (in dollars per share)		$ 0.33	$ 0.46
Profit per common share - diluted (in dollars per share)	[2]	$ 0.32	$ 0.46
Statement of Comprehensive Income
Profit of consolidated and affiliated companies		$ 194	$ 272
Foreign currency translation, net of tax		147	408
Total other comprehensive income (loss), net of tax		212	542
Comprehensive income		406	814
Comprehensive income attributable to stockholders		404	813
Statement of Financial Position
Noncurrent deferred and refundable income taxes		2,940			$ 2,790
Liability for postemployment benefits		9,291			9,357
Profit employed in the business		27,584			27,377
Accumulated other comprehensive income (loss)		(1,827)	(1,493)		(2,039)	$ (2,035)
Statement of Shareholders' Equity
Profit of consolidated and affiliated companies		194	272
Foreign currency translation, net of tax		147	408
Pension and other postretirement benefits, net of tax		4	108
Total stockholders' equity		13,660	15,753	$ 13,228	$ 13,213	$ 14,885
Statement of Cash Flow
Profit of consolidated and affiliated companies		194	272
Adjustments for non-cash items: Other		301	269
Other assets - net		(261)	(145)
Other liabilities - net		$ (23)	$ (152)

[1] 1 Profit attributable to common shareholders.

[2] 2 Diluted by assumed exercise of stock-based compensation awards using the treasury stock method.