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Leases (Tables)
9 Months Ended
Sep. 30, 2019
Leases [Abstract]  
Lease, Cost and Other Information
Lease Cost:
(In millions)Three months ended September 30, 2019Nine months ended September 30, 2019
Operating lease cost$26  $82  
Short-term lease cost  
Variable lease cost  
Sublease income(4) (13) 
Total lease cost$24  $75  
Other information:
(In millions) Nine months ended September 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
   Operating cash flows from operating leases$77  
Right-of-use assets obtained in exchange for new operating lease liabilities215  

Lease Term and Discount Rate for operating leases:
September 30, 2019
Weighted average remaining lease term (in years)7.9
Weighted average discount rate5.74 %
Schedule of Annual Payments Based on Maturities of Leases
As of September 30, 2019, annual payments based on the maturities of NRG's leases are expected to be as follows:
(In millions)
Remainder of 2019$26  
202094  
202186  
202286  
202386  
Thereafter372  
Total undiscounted lease payments$750  
Less: present value adjustment(177) 
Total discounted lease payments$573