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Benefit Plans and Other Postretirement Benefits - Amounts Recognized in the Balance Sheets and OCI (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pension Benefits |  |  |
Amounts recognized in balance sheet |  |  |
Other current liabilities | $ 0 | $ 0 |
Other non-current liabilities | 192 | 116 |
Amounts recognized in accumulated OCI |  |  |
Net loss/(gain) | 110 | 52 |
Prior service cost/(credit) | 1 | 2 |
Total/Net accumulated OCI | 111 | 54 |
Other changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |
Net actuarial loss/(gain) | 74 | (72) |
Amortization of net actuarial loss | (3) | (1) |
Amortization of prior service cost | 0 | 0 |
Effect of settlement/curtailment | (14) | (2) |
Other changes in plan assets and benefit obligations recognized in other comprehensive income | 57 | (75) |
Net periodic benefit cost/(credit) | 18 | (27) | $ (8)
Net recognized in net periodic pension cost/(credit) and OCI | 75 | (102) |
Significant components of NRG's domestic pension plan |  |  |
Projected benefit obligation | 1,036 | 1,452 | 1,489
Accumulated benefit obligation | 1,022 | 1,423 |
Fair value of plan assets | 844 | 1,336 | 1,272
Other Postretirement Benefits Plan |  |  |
Amounts recognized in balance sheet |  |  |
Other current liabilities | 7 | 7 |
Other non-current liabilities | 77 | 98 |
Amounts recognized in accumulated OCI |  |  |
Net loss/(gain) | (7) | 5 |
Prior service cost/(credit) | (12) | (19) |
Total/Net accumulated OCI | (19) | (14) |
Other changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |
Net actuarial loss/(gain) | (11) | 0 |
Amortization of net actuarial loss | (2) | (1) |
Amortization of prior service cost | 8 | 10 |
Effect of settlement/curtailment | 0 | 0 |
Other changes in plan assets and benefit obligations recognized in other comprehensive income | (5) | 9 |
Net periodic benefit cost/(credit) | (4) | (6) | (10)
Net recognized in net periodic pension cost/(credit) and OCI | (9) | 3 |
Significant components of NRG's domestic pension plan |  |  |
Projected benefit obligation | 84 | 105 | 90
Fair value of plan assets | $ 0 | $ 0 | $ 0

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