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Financial Instruments - Effect of Interest Rate Swaps on Results of Operations (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]  
Amount of Gain Recognized in OCI on Derivatives, Net of Tax $ (45)
Interest Rate Swaps [Member]  
Derivative Instruments, Gain (Loss) [Line Items]  
Amount of Gain Recognized in OCI on Derivatives, Net of Tax 45
Interest Rate Swaps [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]  
Derivative Instruments, Gain (Loss) [Line Items]  
Interest rate swaps $ 15