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Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Financial instruments    
Long-term debt, including current maturities $ 9,157 $ 9,261
Carrying amount    
Financial instruments    
Cash and cash equivalents 1,483 1,790
Restricted cash and cash equivalents 531 558
Long-term debt, including current maturities 9,157 9,261
Derivative instruments, assets   1
Derivative instruments, liabilities 5  
Fair value    
Financial instruments    
Cash and cash equivalents 1,483 1,790
Restricted cash and cash equivalents 531 558
Long-term debt, including current maturities 5,001 8,976
Derivative instruments, assets   $ 1
Derivative instruments, liabilities $ 5