Annual report pursuant to Section 13 and 15(d)

Income Taxes (Deferred tax assets and liabilities) (Details)

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Income Taxes (Deferred tax assets and liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Deferred Tax Assets, Gross [Abstract]    
Accrued liabilities and deferred revenues $ 97 $ 87
Tax credits 6 12
Provision for doubtful accounts 17 20
Net operating loss carryforward 18 14
Other 20 14
Valuation allowance (19) (15)
Deferred income tax assets 139 132
Deferred income tax liabilities:    
Depreciation and amortization 508 517
Other 15 12
Deferred income tax liabilities 523 529
Deferred Tax Liabilities, Net 384 397
Foreign tax credits 6  
Net Operating Loss Carryforward    
Deferred Tax Assets, Gross [Abstract]    
Valuation allowance (14) (11)
Deferred Tax Asset    
Deferred Tax Assets, Gross [Abstract]    
Valuation allowance (3) (3)
Foreign Tax Credit    
Deferred Tax Assets, Gross [Abstract]    
Valuation allowance (2) (1)
Other non-current assets    
Deferred income tax liabilities:    
Deferred Tax Liabilities, Net 3 2
Deferred income taxes    
Deferred income tax liabilities:    
Deferred Tax Liabilities, Net $ 387 $ 399