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Financial Instruments (Fair Values of Derivatives Instruments) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value, Asset Derivatives $ 121 $ 111
Fair Value, Derivative Liabilities 134 117
Derivatives designated as hedging instruments | Interest rate swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value, Asset Derivatives 72 61
Fair Value, Derivative Liabilities 0 0
Derivatives not designated as hedging instruments | Foreign exchange contracts    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value, Asset Derivatives 3 4
Fair Value, Derivative Liabilities 3 6
Derivatives not designated as hedging instruments | Interest rate caps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value, Asset Derivatives 46 46
Fair Value, Derivative Liabilities $ 131 $ 111