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Fair Value Measurements (Narrative) (Details)
kr in Millions, $ in Millions
9 Months Ended
Mar. 03, 2020
USD ($)
Sep. 30, 2020
USD ($)
Mar. 03, 2020
SEK (kr)
Dec. 31, 2019
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]        
Letters of credit posted as collateral under fuel hedging program   $ 2    
Hedging gains and losses in accumulated other comprehensive income expected to be recognized in earnings, net of tax   (5)    
Carrying Value [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Long term debt and capital lease obligation   1,665   $ 1,735
Estimated Fair Value [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Fair value of total debt   $ 1,739   $ 1,839
Cross-Currency Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Swap interest payment percent, foreign 3.50%      
Swap interest payment percent 4.147%      
Term of agreement   5 years    
Derivative, maturity date   Mar. 31, 2025    
Aggregate notional amount $ 74   kr 725  
Cross Currency Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Term of agreement   5 years    
Derivative, maturity date   Mar. 31, 2025    
Aggregate notional amount $ 131   kr 1,275  
Derivative fixed rate 0.00%   0.00%  
Fuel Swap Contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Aggregate notional amount   $ 28