Acquisitions And Divestitures Sale of Reception Systems Business (Details) - USD ($) $ in Millions	3 Months Ended								6 Months Ended	12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jul. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from business divestitures										$ 197	$ 11	$ 0
Net sales	$ 4,313	$ 4,091	$ 4,206	$ 4,051	$ 3,879	$ 3,631	$ 3,858	$ 3,797		16,661	15,165	$ 15,499
Gain (loss) on business divestitures										$ 141	(8)
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Reception Systems
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
Electronics And Safety | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Reception Systems | Cost of Sales
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on business divestitures											$ 39