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Fair Value Measurements - Debt (Detail) - USD ($)
$ in Billions
Jun. 30, 2020
Dec. 31, 2019
Reported Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of Debt $ 12.8 $ 13.5
Significant Other Observable Inputs (Level 2) [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of Debt $ 13.9 $ 14.5