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Description of Business and Significant Accounting Policies - Effects on income due to new accounting pronouncements (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Depreciation $ 0 $ 0
Amortization of intangible assets 0 0
Depreciation and amortization of intangible assets 11 30
Interest expense, bank fees and other, net 0 0
Interest expense, bank fees and other (5) (17)
Interest income 3 7
As previously reported    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Depreciation 10 26
Amortization of intangible assets 1 4
Depreciation and amortization of intangible assets 0 0
Interest expense, bank fees and other, net (2) (10)
Interest expense, bank fees and other 0 0
Interest income 0 0
Reclassified amounts    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Depreciation (10) (26)
Amortization of intangible assets (1) (4)
Depreciation and amortization of intangible assets 11 30
Interest expense, bank fees and other, net 2 10
Interest expense, bank fees and other (5) (17)
Interest income $ 3 $ 7