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Derivative Financial Instruments (Schedule of Volume of Derivative Activity) (Detail)
$ in Millions
Mar. 31, 2021
USD ($)
[1]
Interest Rate Swap Current [Member]  
Derivative [Line Items]  
Interest rate $ 0
Interest Rate Swap Noncurrent [Member]  
Derivative [Line Items]  
Interest rate $ 71
[1] Maturity is determined based on final settlement period.