Revenue Recognition - Summary of RPOs Expected Revenue Recognition (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Total RPOs	$ 16,375	$ 18,019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-04-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Total RPOs	$ 5,854
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-04-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Total RPOs	$ 5,766
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-04-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Total RPOs	$ 4,755
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period