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Derivative Financial Instruments - Carrying Value and Related Fair Value Hedging Adjustments of Liabilities (Detail) - Designated as Hedging Instrument [Member] - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Short-term borrowings [Member]    
Derivatives Fair Value [Line Items]    
Carrying Value $ 1,685 $ 631
Hedge Basis Adjustments 30 4
Long-term borrowings [Member]    
Derivatives Fair Value [Line Items]    
Carrying Value 8,271 11,017
Hedge Basis Adjustments $ 465 $ 541