Acquisitions And Divestitures Sale of Mechatronics Business (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from business divestitures									$ 0	$ 197	$ 11
Net sales	$ 3,440	$ 3,148	$ 3,153	$ 3,143	$ 3,193	$ 3,039	$ 3,084	$ 2,958	12,884	12,274	10,864
Gain (loss) on business divestitures										$ 141	$ (8)
Mechatronics Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on business divestitures	$ 141
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax									29
Mechatronics Business | Disposal Group, 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									197
Advanced Safety and User Experience | Mechatronics Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on business divestitures									141
Advanced Safety and User Experience | Mechatronics Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales									290
Gain on divestiture, net of tax									$ 124
Gain on divestiture, net of tax, per share									$ 0.45