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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 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   10   19
Interest expense, bank fees and other, net   0   0
Interest expense, bank fees and other   (7)   (13)
Interest income   3   5
Other comprehensive income   1   0
Comprehensive income $ 47 59 $ 110 112
As previously reported        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Depreciation   8   16
Amortization of intangible assets   2   3
Depreciation and amortization of intangible assets   0   0
Interest expense, bank fees and other, net   (4)   (8)
Interest expense, bank fees and other   0   0
Interest income   0   0
Other comprehensive income   0   0
Comprehensive income   58   112
Reclassified amounts        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Depreciation   (8)   (16)
Amortization of intangible assets   (2)   (3)
Depreciation and amortization of intangible assets   10   19
Interest expense, bank fees and other, net   4   8
Interest expense, bank fees and other   (7)   (13)
Interest income   3   5
Other comprehensive income   1   0
Comprehensive income   $ 1   $ 0