Incomes Taxes (DTA and DTL) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred tax liabilities
Intangibles	$ 610	$ 765
Property, net	185	199
LIFO inventory	38	59
Other	177	156
Total deferred tax liabilities	1,010	1,179
Deferred tax assets
U.S. general business credit carryforwards, including Energy Tax Credits	927	964
Pensions	220	322
Loss carryforwards	880	668
Postretirement obligations	109	144
Foreign tax credit carryforwards	0	310
Research and development capitalization	129	273
Employee payroll and benefits	56	111
Accrued expenses	170	106
Product warranty accrual	55	64
Receivable and inventory allowances	56	59
Other	521	344
Total deferred tax assets	3,123	3,365
Valuation allowances for deferred tax assets	(178)	(150)
Deferred tax assets, net of valuation allowances	2,945	3,215
Net deferred tax assets	$ 1,935	$ 2,036