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Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Financial instruments    
Restricted cash and cash equivalents $ 558 $ 429
Long-term debt, including current maturities 9,261 9,978
Carrying amount    
Financial instruments    
Cash and cash equivalents 1,790 2,160
Restricted cash and cash equivalents 558 429
Restricted investments   123
Long-term debt, including current maturities 9,261 9,978
Derivative instruments, assets 1  
Derivative instruments, liabilities   6
Fair value    
Financial instruments    
Cash and cash equivalents 1,790 2,160
Restricted cash and cash equivalents 558 429
Restricted investments   123
Long-term debt, including current maturities 8,976 9,212
Derivative instruments, assets $ 1  
Derivative instruments, liabilities   6
Other current assets    
Financial instruments    
Restricted cash and cash equivalents   428
Other assets    
Financial instruments    
Restricted cash and cash equivalents   1
Significant other observable inputs | Other current assets | Fair value    
Financial instruments    
Restricted investments   $ 123