Acquisition of Business (Details) - Cruise Automation [Member] $ in Millions	May 12, 2016 USD ($)
Business Acquisition [Line Items]
Consideration transferred	$ 581
Cash payments to acquire businesses	291
Corporate [Member]
Business Acquisition [Line Items]
Intangible assets	130
Deferred tax liabilities	39
Goodwill resulting from the acquisition	490
Common Stock [Member]
Business Acquisition [Line Items]
Issuance of new common stock	$ 290