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Fair Value Measurement - Summary of Financial Instrument Measured on a Basis Other Than Fair Value (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total $ 27,389 $ 26,172
Senior Notes Included Under Senior Notes and Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 24,775 23,459
Senior Notes and Convertible Senior Debentures Included Under Short-Term Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total $ 2,614 $ 2,713