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Income Taxes (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]        
Unrecognized Tax Benefits $ 36 $ 33 $ 31 $ 26
Deferred Tax Liabilities, Gross (1,696) (1,553)    
Deferred Tax Liabilities, Property, Plant and Equipment (1,423) (1,270)    
Deferred Tax Assets, Net of Valuation Allowance 445 441    
Deferred Tax Assets, Valuation Allowance 31 21    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits 47 35    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount (10)      
Deferred Tax Liabilities, Net (1,251) (1,112)    
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount 31 8 28  
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount 2 2 (4)  
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent 17 20    
Deferred Tax Assets, Deferred Income 127 106    
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions 0 0 2  
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions 6 5 6  
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions (3) (3) (3)  
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount 161 45 $ 322  
Deferred Tax Liabilities, Net, Noncurrent 1,251 $ 1,112    
Unrecognized tax benefits would impact on effective tax rate $ 15