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Acquisitions and Divestitures (Divestiture) (Details) - CAR, Inc
shares in Millions, $ in Millions
1 Months Ended
Mar. 31, 2016
USD ($)
shares
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Ownership percentage 1.70%
Common Stock  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Number of shares sold | shares 204
Gross sales proceeds $ 240
Net sales proceeds 233
Deferred gain on sale 7
Common Stock | Other Operating Income (Expense)  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Pre-tax gain on sale of stock $ 75