XML 153 R130.htm IDEA: XBRL DOCUMENT v3.25.0.1
Benefit Plans and Other Postretirement Benefits - Expected Future Benefit Payments for the Next Five Years and Other (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Company's contributions to 401(k) plans      
Company contributions to defined contribution plans $ 62 $ 61 $ 37
Benefit Payments      
NRG's expected future benefit payments      
2025 93    
2026 77    
2027 75    
2028 73    
2029 71    
2030-2034 336    
Other Postretirement Benefits Plan      
NRG's expected future benefit payments      
2025 5    
2026 5    
2027 5    
2028 5    
2029 5    
2030-2034 28    
Medicare prescription drug reimbursements      
2025 0    
2026 0    
2027 0    
2028 0    
2029 0    
2030-2034 $ 2