Leases - Schedule of Lease Receivables Relating to Sales-Type Leases (Detail) - USD ($) |
Dec. 31, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Sales Type Lease Net Investment In Lease Past Due [Line Items] | ||
| Gross lease receivables | $ 102,000,000 | |
| Unearned interest income | (11,000,000) | |
| Net investment in sales-type leases | 91,000,000 | $ 0 |
| Prepaid Expenses and Other Current Assets [Member] | ||
| Sales Type Lease Net Investment In Lease Past Due [Line Items] | ||
| Net investment in sales-type leases | 17,000,000 | |
| Other Assets [Member] | ||
| Sales Type Lease Net Investment In Lease Past Due [Line Items] | ||
| Net investment in sales-type leases | $ 74,000,000 |