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Benefit Plans and Other Postretirement Benefits (Tables)
12 Months Ended
Dec. 31, 2024
Retirement Benefits [Abstract]  
Schedule of Net Benefit Cost (Credit) Related to Pension and Other Postretirement Benefit Plans Components
The annual net periodic benefit cost/(credit) related to NRG's pension and other postretirement benefit plans include the following components:
 Year Ended December 31,
 Pension Benefits
 (In millions)202420232022
Service cost benefits earned$$$
Interest cost on benefit obligation48 50 41 
Expected return on plan assets(47)(39)(47)
Amortization of unrecognized net loss
Curtailment and special termination benefits (income)/expense(6)(1)14 
Net periodic benefit cost$— $21 $18 
 Year Ended December 31,
 Other Postretirement Benefits
(In millions)202420232022
Interest cost on benefit obligation$$$
Amortization of unrecognized prior service cost(3)(8)(8)
Amortization of unrecognized net loss(1)
Net periodic benefit credit$(1)$(3)$(4)
Schedule of Comparison of Pension Benefit Obligation, Other Postretirement Benefit Obligations and Related Plan Assets on a Combined Basis
A comparison of the pension benefit obligation, other postretirement benefit obligations and related plan assets for NRG's plans on a combined basis is as follows:
 As of December 31,
 Pension BenefitsOther Postretirement
Benefits
(In millions)2024202320242023
Benefit obligation at January 1$1,023 $1,036 $75 $84 
Service cost— — 
Interest cost48 50 
Actuarial loss/(gain)(35)22 (1)(5)
Employee and retiree contributions— — 
Annuity purchase settlement(50)— — — 
Curtailment and special termination benefit loss— (2)— (1)
Benefit payments(83)(89)(10)(11)
Foreign exchange translation(5)— — 
Benefit obligation at December 31901 1,023 70 75 
Fair value of plan assets at January 1851 844 — — 
Actual return on plan assets16 93 — — 
Employee and retiree contributions— — 
Employer contributions38 
Annuity purchase settlement(50)— — — 
Benefit payments(83)(89)(10)(11)
Foreign exchange translation(5)— — 
Fair value of plan assets at December 31767 851 — — 
Funded status at December 31 — excess of obligation over assets
$(134)$(172)$(70)$(75)
Schedule of Amounts Recognized in Balance Sheet
Amounts recognized in NRG's balance sheets were as follows:
 As of December 31,
 Pension BenefitsOther Postretirement
Benefits
(In millions)2024202320242023
Other current liabilities$— $— $$
Other non-current liabilities134 172 65 70 
Schedule of Amounts Recognized in OCI Not Yet Recognized as Components of Net Periodic Benefit Costs
Amounts recognized in NRG's accumulated OCI that have not yet been recognized as components of net periodic benefit cost were as follows:
 As of December 31,
 Pension BenefitsOther Postretirement
Benefits
(In millions)2024202320242023
Net loss/(gain)$73 $73 $(14)$(14)
Prior service cost/(credit)— — (1)(4)
Total accumulated OCI$73 $73 $(15)$(18)
Schedule of Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Other changes in plan assets and benefit obligations recognized in OCI were as follows:
 Year Ended December 31,
 Pension BenefitsOther Postretirement
Benefits
(In millions)2024202320242023
Net actuarial (gain)/loss$(4)$(31)$(1)$(5)
Amortization of net actuarial loss(2)(6)(1)
Settlement (gain)/loss— — — 
Amortization of prior service cost— — 
Effect of settlement/curtailment— (1)— (1)
Total recognized in OCI$— $(38)$$
Net periodic benefit cost/(credit)
— 21 (1)(3)
Net recognized in net periodic pension (credit)/cost and OCI
$— $(17)$$(2)
Schedule of Benefit Obligations Significant Components
The following table presents the balances of significant components of NRG's pension plan:
 As of December 31,
 Pension Benefits
(In millions)20242023
Projected benefit obligation$901 $1,023 
Accumulated benefit obligation895 1,015 
Fair value of plan assets767 851 
Schedule of Fair Value of Pension Plan Assets by Asset Category and Level within the Fair Value Hierarchy
NRG's market-related value of its plan assets is the fair value of the assets. The fair values of the Company's pension plan assets by asset category and their level within the fair value hierarchy are as follows:
 Fair Value Measurements as of December 31, 2024
(In millions)Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant
Observable Inputs
(Level 2)
Total
Common/collective trust investment — U.S. equity$— $142 $142 
Common/collective trust investment — non-U.S. equity— 105 105 
Common/collective trust investment — non-core assets— 50 50 
Common/collective trust investment — fixed income— 199 199 
Short-term investment fund25 — 25 
Subtotal fair value$25 $496 $521 
Measured at net asset value practical expedient:
Common/collective trust investment — non-U.S. equity29 
Common/collective trust investment — fixed income177 
Common/collective trust investment — non-core assets12 
Partnerships/joint ventures28 
Total fair value$767 
 Fair Value Measurements as of December 31, 2023
(In millions)Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant
Observable Inputs
(Level 2)
Total
Common/collective trust investment — U.S. equity$— $156 $156 
Common/collective trust investment — non-U.S. equity— 58 58 
Common/collective trust investment — non-core assets— 81 81 
Common/collective trust investment — fixed income— 188 188 
Short-term investment fund19 — 19 
Subtotal fair value$19 $483 $502 
Measured at net asset value practical expedient:
Common/collective trust investment — non-U.S. equity32 
Common/collective trust investment — fixed income243 
Common/collective trust investment — non-core assets47 
Partnerships/joint ventures27 
Total fair value$851 
Schedule of Assumptions Used to Calculate Benefit Expense
The following table presents the significant assumptions used to calculate NRG's benefit obligations:
 As of December 31,
 Pension BenefitsOther Postretirement Benefits
Weighted-Average Assumptions2024202320242023
Discount rate5.63 %4.97 %5.55 %4.96 %
Interest crediting rate5.38 %5.67 %4.54 %4.66 %
Rate of compensation increase3.00 %3.06 %— — 
Health care trend rate— — 
 8.3% grading to 4.5% in 2034
7.7% grading to 4.5% in 2033
The following table presents the significant assumptions used to calculate NRG's benefit expense:
 As of December 31,
 Pension BenefitsOther Postretirement Benefits
Weighted-Average Assumptions202420232022202420232022
Discount rate4.99 %5.18 %
2.89%/4.71%/5.41%
4.96 %5.19 %2.82 %
Interest crediting rate5.67 %5.21 %3.07 %4.66 %4.00 %1.94 %
Expected return on plan assets
6.65 %5.55 %4.99 %— — — 
Rate of compensation increase
3.00 %3.06 %3.06 %— — — 
Health care trend rate— — — 
 7.4% grading to 4.5% in 2033
 7.2% grading to 4.5% in 2028
6.9% grading to 4.4% in 2028
Schedule of Target Allocation of Pension Plan Assets
The target allocations of NRG's pension plan assets were as follows for the year ended December 31, 2024:
U.S. equity20 %
Non-U.S. equity13 %
Non-core assets17 %
Fixed income50 %
Schedule of Performance Benchmarks Performance benchmarks are composed of the following indices:
Asset ClassIndex
U.S. equitiesDow Jones U.S. Total Stock Market Index
Non-U.S. equities
MSCI All Country World Index
Non-core assets(a)
Various (per underlying asset class)
Fixed income securities
Barclays Short, Intermediate and Long Credits/Barclays Strips 20+ Index and FTSE Canada Universe Bond Index
(a)Non-Core Assets are defined as diversifying asset classes approved by the Investment Committee that are intended to enhance returns and/or reduce volatility of the U.S. and non-U.S. equities. Asset classes considered Non-Core include, but may not be limited to: Emerging Market Equity, Emerging Market Debt, Non-US Developed Market Small Cap, High Yield Fixed Income, Real Estate, Bank Loans, Global Infrastructure and other Alternatives
Schedule of Expected Benefit Payments
NRG's expected future benefit payments for each of the next five years, and in the aggregate for the five years thereafter, are as follows:
 PensionOther Postretirement Benefit
 (In millions)Benefit PaymentsBenefit PaymentsMedicare Prescription Drug Reimbursements
2025$93 $$— 
202677 — 
202775 — 
202873 — 
202971 — 
2030-2034336 28 
Defined Contribution Plan Contributions
The Company's costs related to these plans were as follows:
 Year Ended December 31,
(In millions)202420232022
Cost recognized for defined contribution plans$62 $61 $37