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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension Benefits |  |  |
Amounts recognized in balance sheet |  |  |
Other current liabilities | $ 0 | $ 0 |
Other non-current liabilities | 217 | 247 |
Amounts recognized in accumulated OCI |  |  |
Net loss | 127 | 138 |
Prior service cost/(credit) | 2 | 2 |
Total/Net accumulated OCI | 129 | 140 |
Other changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |
Net actuarial (gain)/loss | (6) | 50 |
Amortization of net actuarial (gain) | (5) | (3) | $ 0
Prior service credit | 0 | 0 |
Amortization of prior service cost | 0 | 0 |
Total recognized in OCI | (11) | 47 |
Net periodic benefit credit | (8) | 0 | 12
Net recognized in net periodic pension credit and OCI | (19) | 47 |
Significant components of NRG's domestic pension plan |  |  |
Projected benefit obligation | 1,489 | 1,397 | 1,222
Accumulated benefit obligation | 1,455 | 1,362 |
Fair value of plan assets | 1,272 | 1,150 | 981
Other Postretirement Benefits Plan |  |  |
Amounts recognized in balance sheet |  |  |
Other current liabilities | 5 | 7 |
Other non-current liabilities | 85 | 86 |
Amounts recognized in accumulated OCI |  |  |
Net loss | 6 | 7 |
Prior service cost/(credit) | (29) | (43) |
Total/Net accumulated OCI | (23) | (36) |
Other changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |
Net actuarial (gain)/loss | 0 | 16 |
Amortization of net actuarial (gain) | (1) | 0 | 0
Prior service credit | 0 | (2) |
Amortization of prior service cost | 14 | 12 |
Total recognized in OCI | 13 | 26 |
Net periodic benefit credit | (10) | (9) | (15)
Net recognized in net periodic pension credit and OCI | 3 | 17 |
Significant components of NRG's domestic pension plan |  |  |
Projected benefit obligation | 90 | 93 | 83
Fair value of plan assets | $ 0 | $ 0 | $ 0

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