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Leases (Schedule of Additional Lease Information) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Cash outflows for lease liabilities: |  |
Operating cash flows, Finance lease | $ 7 | $ 7
Weighted average remaining lease term (years), Finance lease | 7 years | 8 years
Weighted average discount rate, Finance lease | 4.20% | 4.20%
Operating cash flows, Operating lease | $ 2 | $ 2
Investing cash flows, Operating lease | $ 8 | 41
Right-of-use assets obtained in exchange for new lease liabilities, Operating lease |  | $ 3
Weighted average remaining lease term (years), Operating lease | 4 years 1 month 6 days | 2 years 2 months 12 days
Weighted average discount rate, Operating lease | 2.90% | 3.20%

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- Definition Amount of interest paid on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918643-209977 + Details
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- Definition Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 + Details
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