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Fair Value Measurements and Financial Instruments - Notional Amounts of Outstanding Derivative Instruments (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Interest rate swaps    
Derivative [Line Items]    
Notional Amount $ 17,004 $ 19,813
Cross currency swaps    
Derivative [Line Items]    
Notional Amount 23,070 16,638
Forward starting interest rate swaps    
Derivative [Line Items]    
Notional Amount 3,000 4,000
Interest rate caps    
Derivative [Line Items]    
Notional Amount 679 2,218
Foreign exchange forwards    
Derivative [Line Items]    
Notional Amount $ 1,130 $ 600