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Leases - Supplemental Balance Sheet Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Lessee, Lease, Description [Line Items]    
Operating lease, right-of-use assets $ 27 $ 41
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other Assets [Member] Other Assets [Member]
Finance lease, right-of-use assets $ 5 $ 10
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Property, Plant and Equipment [Member] Property, Plant and Equipment [Member]
Total ROU assets $ 32 $ 51
Current operating lease liability $ 15 $ 17
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accrued Liabilities [Member] Accrued Liabilities [Member]
Current finance lease liability $ 4 $ 5
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Other Current Liabilities [Member] Other Current Liabilities [Member]
Long-term operating lease liabilities $ 17 $ 25
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Long Term Operating Lease Liabilities [Member] Long Term Operating Lease Liabilities [Member]
Long-term finance lease liability $ 3 $ 6
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other Regulatory Assets (Liabilities) [Member] Other Regulatory Assets (Liabilities) [Member]
Total lease liabilities $ 39 $ 53