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Derivative Instruments And Hedging Activities - Summary of Net Gain (Loss) on Foreign Exchange Forwards Not Designated as Hedging Instruments (Detail)
£ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
GBP (£)
Derivative Instruments, Gain (Loss) [Line Items]          
Foreign exchange forwards amount of gain (loss) recognized in income $ (13) $ 0 $ (13) $ 0  
Not Designated as Accounting Hedges | Forward Contracts          
Derivative Instruments, Gain (Loss) [Line Items]          
Foreign exchange forwards amount of gain (loss) recognized in income (13)   (13)    
Other non-operating income, net | Designated as Hedging Instrument          
Derivative Instruments, Gain (Loss) [Line Items]          
Foreign exchange forwards amount of gain (loss) recognized in income (18) 36 (25) 1  
Other non-operating income, net | Designated as Hedging Instrument | RMS          
Derivative Instruments, Gain (Loss) [Line Items]          
Foreign exchange forwards amount of gain (loss) recognized in income (13) $ 0 (13) $ 0  
Other non-operating income, net | Not Designated as Accounting Hedges | RMS          
Derivative Instruments, Gain (Loss) [Line Items]          
Notional Amount $ 1,675   $ 1,675   £ 1,200