Accounting and Reporting Developments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash used by operating activities	$ (751)	$ (577)
Net cash provided by investing activities	58	153
Beneficial interests obtained in securitized receivables	199	265
Cost of products sold	1,808	1,531
Reclassification of net benefit to pension and other postretirement	$ 17	12
Cumulative effect of change in accounting principle				$ 3
Accounting Standards Update 2016-15
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash used by operating activities		257
Net cash provided by investing activities		257
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of products sold		(12)
Reclassification of net benefit to pension and other postretirement		$ 12
Retained Earnings | Accounting Standards Update 2017-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting principle			$ (3)
Accumulated Other Comprehensive Income | Accounting Standards Update 2017-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting principle			$ 3