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Leases (Schedule of Right-of-use Assets and Lease Liabilities) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Leases [Abstract] |  |  |
Right-of-use assets, finance lease |  | $ 214 | $ 220
Finance lease liabilities: |  |  |
Current lease liabilities, finance lease | [1] | 8 | 8
Long-term lease liabilities, finance lease |  | 246 | 244
Total lease liabilities, finance lease |  | 254 | 252
Right-of-use assets, operating lease |  | 30 | 3
Operating lease liabilities: |  |  |
Current lease liabilities, operating lease | [1] | 20 | 1
Long-term lease liabilities, operating lease |  | 10 | 2
Total lease liabilities, operating lease |  | 30 | 3
Right-of-use assets |  | 244 | 223
Lease liabilities: |  |  |
Current lease liabilities | [1] | 28 | 9
Long-term lease liabilities |  | 256 | 246
Total lease liabilities |  | $ 284 | $ 255
[1] | Current lease liabilities are included in other current liabilities on the consolidated balance sheets.

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980 Reference 2: 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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