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Leases (Tables) | 12 Months Ended
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Dec. 31, 2020
Leases [Abstract] |
Lease Cost | Lease Cost:
(In millions) | For the Year Ended December 31, 2020 |  | For the Year Ended December 31, 2019
Finance lease cost | $ | 3 |  |  | $ | — |
Operating lease cost | 100 |  |  | 109 |
Short-term lease cost | 3 |  |  | 3 |
Variable lease cost | 6 |  |  | 6 |
Sublease income | (17) |  |  | (17) |
Total lease cost | $ | 95 |  |  | $ | 101 |
Other information:
(In millions) | For the Year Ended December 31, 2020 |  | For the Year Ended December 31, 2019
Cash paid for amounts included in the measurement of lease liabilities: |  |  |
Operating cash flows from operating leases | $ | 101 |  |  | $ | 104 |
Financing cash flows from finance leases | 1 |  |  | — |
Right-of-use assets obtained in exchange for new finance lease liabilities | 5 |  |  | — |
Right-of-use assets obtained in exchange for new operating lease liabilities | 4 |  |  | 215 |
Lease Term and Discount Rate for leases:
| December 31, 2020 |  | December 31, 2019
Finance leases: |  |  |
Weighted average remaining lease term (in years) | 1.1 |  | — |
Weighted average discount rate | 4.79 | % |  | — |
Operating leases: |  |  |
Weighted average remaining lease term (in years) | 5.3 |  | 7.8
Weighted average discount rate | 5.63 | % |  | 5.72 | %
Schedule of Annual Payments Based on Maturities of Leases | As of December 31, 2020, annual payments based on the maturities of NRG's leases are expected to be as follows:
| (In millions)
2021 | $ | 86 |
2022 | 82 |
2023 | 81 |
2024 | 71 |
2025 | 47 |
Thereafter | 34 |
Total undiscounted lease payments | $ | 401 |
Less: present value adjustment | (54) |
Total discounted lease payments | $ | 347 |

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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