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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]            
Unrecognized Tax Benefits that Would Impact Effective Tax Rate       $ 15    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount       10    
Tax Credit Carryforward, Limitations on Use       3    
Deferred Tax Assets, Deferred Income $ 106     $ 127 $ 106  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent       35.00%    
Statutory Tax Rate After 2017 Reform       21.00%    
Tax Cuts and Jobs Act, Incomplete Accounting, Provisional Income Tax Expense (Benefit)           $ (551)
Deferred Tax Assets, Tax Credit Carryforwards, Foreign 32     $ 42 32  
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount       0 (28) (564)
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) (17) $ (4) $ (7)   (28) (564)
Deferred:            
Federal       119 82 (356)
State       20 7 24
Deferred Foreign Income Tax Expense (Benefit)       0 1 23
Deferred income tax expense (benefit)       139 90 (309)
Current Federal Tax Expense (Benefit)       36 (61) 94
Current State and Local Tax Expense (Benefit)       19 (5) 18
Current Foreign Tax Expense (Benefit)       5 6 (25)
Current income tax expense (benefit)       60 (60) 87
Total income tax expense (benefit)       199 30 (222)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount       8 5 3
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount       (3) (2) $ (7)
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits 35     47 35  
Deferred Tax Assets, Operating Loss Carryforwards 28     31 28  
Deferred Tax Assets, Operating Lease Liabilities 241     212 241  
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent 20     17 20  
Deferred Tax Assets, Gross 462     476 462  
Deferred Tax Assets, Valuation Allowance (21)     (31) (21)  
Deferred Tax Assets, Net of Valuation Allowance 441     445 441  
Deferred Tax Liabilities, Property, Plant and Equipment (1,270)     (1,423) (1,270)  
Deferred Tax Liabilities, Leasing Arrangements 266     236 266  
Deferred Tax Liabilities, Other (17)     (37) (17)  
Deferred Tax Liabilities, Gross 1,553     1,696 1,553  
Deferred Tax Liabilities, Net $ 1,112     $ 1,251 $ 1,112