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Share-Based Payments - Data Related to All Restricted Stock Unit Activity (Detail) - Restricted Stock Units [Member]
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Employee
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total fair value of shares vested | $ $ 454 $ 146 $ 584
Total compensation cost related to nonvested RSU awards not yet recognized, pre-tax | $ $ 241 $ 256 $ 254
Weighted-average period over which RSU cost is expected to be recognized (years) 1 year 8 months 12 days 1 year 8 months 12 days 1 year 8 months 12 days
Number of shares modified to accelerate vesting | shares     6.4
Number of employees affected by accelerated vesting | Employee     9,900
Number of shares scheduled for near-term vesting | shares     6.6