Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Inventory	$ 29	$ 30
Accrued liabilities and allowances	136	136
Employee benefits	693	612
Capitalized items	169	357
Tax basis differences on investments	7	14
Depreciation tax basis differences on fixed assets	74	19
Undistributed non-U.S. earnings	(27)	(19)
Tax carryforwards	927	1,028
Business reorganization	36	20
Warranty and customer liabilities	21	20
Deferred revenue and costs	122	146
Valuation allowances	(118)	(129)
Deferred charges	37	41
Other	(8)
Other		3
Deferred tax assets (liabilities), total	$ 2,098	$ 2,278