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Fair Value Measurement - Summary of Financial Instrument Measured on a Basis Other Than Fair Value (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	$ 25,004	$ 25,700
Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	22,686	23,560
Senior Notes and Convertible Senior Debentures Included Under Short-Term Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	$ 2,318	$ 2,140