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Guarantees (Tables)
12 Months Ended
Dec. 31, 2020
Guarantees [Abstract]  
Summary of maximum potential exposure that can be estimated by NRG's guarantees, indemnity, and other contingent liability
The following table summarizes the maximum potential exposures that can be estimated for NRG's guarantees, indemnities, and other contingent liabilities by maturity:
 By Remaining Maturity at December 31,
(In millions)2020 
Guarantees
Under
1 Year
1-3 Years3-5 Years
Over
5 Years
Total2019 Total
Letters of credit and surety bonds$1,049 $73 $31 $— $1,153 $1,024 
Asset sales guarantee obligations86 282 26 112 506 698 
Other guarantees— — — 87 87 288 
Total guarantees$1,135 $355 $57 $199 $1,746 $2,010