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 |