Income and Other Taxes - Deferred Tax Asset And Liability (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Deferred Tax Assets And Liabilities [Line Items]
Undistributed Earnings of Foreign Subsidiaries	$ 9,000
Research and development	377	$ 475
Post-retirement medical benefits	311	341
Net operating losses	415	531
Operating reserves, accruals and deferrals	351	318
Tax credit carryforwards	678	579
Deferred compensation	247	286
Pension	563	672
Other	138	177
Subtotal	3,080	3,379
Valuation allowance	(410)	(538)
Total	2,670	2,841
Unearned income and installment sales	928	883
Intangibles and goodwill	972	1,161
Other	116	160
Total	2,016	2,204
Total Deferred Taxes, Net	654	637
Valuation Allowance, Deferred Tax Asset, Change in Amount	(128)	$ (76)
Deferred Tax Assets, Tax Credit Carryforwards	678
Net Operating Loss Carryforwards, Expire	1,100
Net Operating Loss Carryforwards, Indefinitely	1,600
Carryforward Indefinitely [Member]
Deferred Tax Assets And Liabilities [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards	97
Carryforwards Expire [Member]
Deferred Tax Assets And Liabilities [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards	$ 581