Leases - Schedule of Supplemental Information Related to Operating Leases (Detail) $ in Millions |
6 Months Ended |
|---|---|
|
Jun. 30, 2019
USD ($)
| |
| Supplemental disclosure of cash flow information: | |
| Cash paid for amounts included in the measurement of operating lease liabilities | $ 70 |
| Supplemental noncash information: | |
| ROU assets in exchange for operating lease liabilities in connection with the adoption of ASU 2016-02 | $ 44 |
| Weighted-average remaining lease term | 9 years |
| Weighted-average discount rate | 3.00% |
| Accounting Standards Update 2016-02 [Member] | |
| Supplemental noncash information: | |
| ROU assets in exchange for operating lease liabilities in connection with the adoption of ASU 2016-02 | $ 661 |