Accounting and Reporting Developments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash used by operating activities			$ (232)	$ (270)
Net cash provided by investing activities			(3,719)	464
Beneficial interests obtained in securitized receivables	$ 456	$ 817
Cost of products sold, excluding depreciation and amortization	2,530	1,972	6,804	5,235
Reclassification of net benefit to pension and other postretirement	$ 13	19	$ 47	43
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		758
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, excluding depreciation and amortization		(16)		(41)
Reclassification of net benefit to pension and other postretirement		$ 19		$ 43
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