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Fair Value Measurements and Financial Instruments - Fair Value of Short-term and Long-term Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short- and long-term debt, excluding finance leases $ 110,373 $ 112,159
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short- and long-term debt, excluding finance leases $ 129,200 $ 118,535