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Spin-Off Charges (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Restructuring charges $ 0 $ 0 $ 0 $ 3
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Restructuring charges 1 8 1 23
Restructuring charges, net of tax   6 1 18
Spin-off [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Restructuring charges     1 21 [1]
Incremental capital expenditures required to effect the spin-off     $ 2 13
Spin-off [Member] | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] | Third-Party Consulting Fees [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Restructuring charges   7   19
Spin-off [Member] | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] | Other Incremental Costs [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Restructuring charges   $ 1   $ 4
Maximum [Member] | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Restructuring charges, net of tax $ 1      
[1] An additional $2 million of Spin-off charges were pre-paid in 2017 and subsequently expensed during the nine months ended September 30, 2018.