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Guarantees (Tables)
 12 Months Ended
Dec. 31, 2021
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)2021 
Guarantees
Under
1 Year
1-3 Years3-5 Years
Over
5 Years
Total2020 Total
Letters of credit and surety bonds$4,064 $31 $— $— $4,095 $1,153 
Asset sales guarantee obligations269 25 24 96 414 506 
Other guarantees— — — 93 93 87 
Total guarantees$4,333 $56 $24 $189 $4,602 $1,746