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Financial Instruments (Fair Values Of Derivatives Instruments) (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value, Derivative Assets $ 11 $ 3
Fair Value, Derivative Liabilities 44 80
Derivatives designated as hedging instruments | Interest rate swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value, Derivative Assets 1 0
Fair Value, Derivative Liabilities 34 69
Derivatives not designated as hedging instruments | Foreign exchange contracts    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value, Derivative Assets 9 3
Fair Value, Derivative Liabilities 6 11
Derivatives not designated as hedging instruments | Interest rate caps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value, Derivative Assets 1 0
Fair Value, Derivative Liabilities $ 4 $ 0