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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

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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