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Leases (Lease Income Associated with Operating Leases) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Lessor, Lease, Description [Line Items] |  |  |
Fixed payments | $ 15 | $ 67 | $ 57
Variable payments | 67 | 131 | 124
Total lease income under operating leases | $ 82 | $ 198 | $ 181
Operating Revenues |  |  |
Lessor, Lease, Description [Line Items] |  |  |
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Income, Regulated and Unregulated Operating Revenue | Other Nonoperating Income, Regulated and Unregulated Operating Revenue | Other Nonoperating Income, Regulated and Unregulated Operating Revenue
Total lease income under operating leases | $ 82 | $ 103 | $ 99
Other Income |  |  |
Lessor, Lease, Description [Line Items] |  |  |
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Income, Regulated and Unregulated Operating Revenue | Other Nonoperating Income, Regulated and Unregulated Operating Revenue | Other Nonoperating Income, Regulated and Unregulated Operating Revenue
Total lease income under operating leases | $ 0 | $ 95 | $ 82

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- Definition Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124258985&loc=SL77919372-209981 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 45 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=123420820&loc=SL77919311-209978 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 6A -URI https://asc.fasb.org/extlink&oid=126900988&loc=SL77927221-108306 + Details
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