Acquisitions And Divestitures Sale of Reception Systems (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jul. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from business divestitures         $ 0 $ 18
Net sales   $ 4,091 $ 3,631   $ 12,348 11,286
Gain (loss) on business divestitures     39     $ 25
Reception Systems | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from business divestitures $ 25          
Buyer-assumed pension liabilities $ 39          
Net sales       $ 55    
Cost of Sales | Electronics And Safety | Reception Systems | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Gain (loss) on business divestitures     $ 39