Income and Other Taxes - Deferred Tax Asset And Liability (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Deferred Tax Assets And Liabilities [Line Items]
Undistributed Earnings of Foreign Subsidiaries	$ 7,000
Research and development	289	$ 370
Post-retirement medical benefits	276	311
Net operating losses	407	367
Operating reserves, accruals and deferrals	190	171
Tax credit carryforwards	751	666
Deferred compensation	197	167
Pension	539	553
Other	81	138
Subtotal	2,730	2,743
Valuation allowance	(416)	(383)
Total	2,314	2,360
Unearned income and installment sales	633	705
Intangibles and goodwill	200	208
Other	48	48
Total	881	961
Total Deferred Taxes, Net	1,433	1,399
Valuation Allowance, Deferred Tax Asset, Change in Amount	(33)	$ 125
Deferred Tax Assets, Tax Credit Carryforwards	751
Net Operating Loss Carryforwards, Expire	700
Net Operating Loss Carryforwards, Indefinitely	1,700
Carryforward Indefinitely [Member]
Deferred Tax Assets And Liabilities [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards	48
Carryforwards Expire [Member]
Deferred Tax Assets And Liabilities [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards	$ 703