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Benefit Plans and Other Postretirement Benefits - Fair Values of Pension Assets By Asset Category and Level Within the Fair Value Hierarchy (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Minimum |  |  |
Significant assumptions used to calculate NRG's benefit expense |  |  |
Aon Hewitt above median yield curve discount rate (in years) | 6 months |  |
Maximum |  |  |
Significant assumptions used to calculate NRG's benefit expense |  |  |
Aon Hewitt above median yield curve discount rate (in years) | 99 years |  |
Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 981 | $ 1,104 | $ 953
Significant assumptions used to calculate NRG's benefit obligations |  |  |
Discount rate | 4.38% | 3.71% |
Rate of compensation increase | 3.00% | 3.00% |
Significant assumptions used to calculate NRG's benefit expense |  |  |
Discount rate |  | 4.26% | 4.52%
Expected return on plan assets | 6.17% | 6.85% | 6.65%
Rate of compensation increase | 3.00% | 3.00% | 3.00%
Pension Benefits | Minimum |  |  |
Significant assumptions used to calculate NRG's benefit expense |  |  |
Discount rate |  | 3.71% |
Pension Benefits | Maximum |  |  |
Significant assumptions used to calculate NRG's benefit expense |  |  |
Discount rate |  | 4.04% |
Other Postretirement Benefit |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 0 | $ 0 | $ 0
Significant assumptions used to calculate NRG's benefit obligations |  |  |
Discount rate | 4.37% | 3.71% |
Rate of compensation increase | 0.00% |  |
Significant assumptions used to calculate NRG's benefit expense |  |  |
Discount rate |  | 4.29% | 4.55%
Expected return on plan assets | 0.00% | 0.00% | 0.00%
Rate of compensation increase | 0.00% | 0.00% | 0.00%
Common/collective trust investment — U.S. equity | Pension Benefits |  |  |
Target allocations |  |  |
Target allocation of pension plan assets (as percent) | 22.00% |  |
Common/collective trust investment — non-U.S. equity | Pension Benefits |  |  |
Target allocations |  |  |
Target allocation of pension plan assets (as percent) | 14.00% |  |
Common/collective trust investment — non-core assets | Pension Benefits |  |  |
Target allocations |  |  |
Target allocation of pension plan assets (as percent) | 19.00% |  |
Common/collective trust investment — fixed income | Pension Benefits |  |  |
Target allocations |  |  |
Target allocation of pension plan assets (as percent) | 45.00% |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets |  |  |
Significant Observable Inputs (Level 2) | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets |  |  |
Postretirement Benefit Obligation | Other Postretirement Benefit |  |  |
Significant assumptions used to calculate NRG's benefit expense |  |  |
Year Health care cost trend rate reaches ultimate trend rate | 2025 |  | 2025
Postretirement Benefit Obligation | Before age 65 | Other Postretirement Benefit |  |  |
Significant assumptions used to calculate NRG's benefit expense |  |  |
Health care trend rate | 7.80% | 8.20% |
Postretirement Benefit Obligation | Age 65 and after | Other Postretirement Benefit |  |  |
Significant assumptions used to calculate NRG's benefit expense |  |  |
Health care trend rate | 4.50% | 4.50% |
Net Period Benefit Cost/Credit | Other Postretirement Benefit |  |  |
Significant assumptions used to calculate NRG's benefit expense |  |  |
Year Health care cost trend rate reaches ultimate trend rate | 2025 | 2025 | 2023
Net Period Benefit Cost/Credit | Before age 65 | Other Postretirement Benefit |  |  |
Significant assumptions used to calculate NRG's benefit expense |  |  |
Health care trend rate | 8.20% | 7.00% | 7.25%
Net Period Benefit Cost/Credit | Age 65 and after | Other Postretirement Benefit |  |  |
Significant assumptions used to calculate NRG's benefit expense |  |  |
Health care trend rate | 4.50% | 5.00% | 5.00%
Other than measured at net asset value practical expedient | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 621 | $ 735 |
Other than measured at net asset value practical expedient | Common/collective trust investment — U.S. equity | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | 183 | 256 |
Other than measured at net asset value practical expedient | Common/collective trust investment — non-U.S. equity | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | 53 | 66 |
Other than measured at net asset value practical expedient | Common/collective trust investment — non-core assets | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | 117 | 178 |
Other than measured at net asset value practical expedient | Common/collective trust investment — fixed income | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | 256 | 230 |
Other than measured at net asset value practical expedient | Short-term investment fund | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | 12 | 5 |
Other than measured at net asset value practical expedient | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | 12 | 5 |
Other than measured at net asset value practical expedient | Quoted Prices in Active Markets for Identical Assets (Level 1) | Common/collective trust investment — U.S. equity | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Other than measured at net asset value practical expedient | Quoted Prices in Active Markets for Identical Assets (Level 1) | Common/collective trust investment — non-U.S. equity | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Other than measured at net asset value practical expedient | Quoted Prices in Active Markets for Identical Assets (Level 1) | Common/collective trust investment — non-core assets | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Other than measured at net asset value practical expedient | Quoted Prices in Active Markets for Identical Assets (Level 1) | Common/collective trust investment — fixed income | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Other than measured at net asset value practical expedient | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investment fund | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | 12 | 5 |
Other than measured at net asset value practical expedient | Significant Observable Inputs (Level 2) | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | 609 | 730 |
Other than measured at net asset value practical expedient | Significant Observable Inputs (Level 2) | Common/collective trust investment — U.S. equity | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | 183 | 256 |
Other than measured at net asset value practical expedient | Significant Observable Inputs (Level 2) | Common/collective trust investment — non-U.S. equity | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | 53 | 66 |
Other than measured at net asset value practical expedient | Significant Observable Inputs (Level 2) | Common/collective trust investment — non-core assets | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | 117 | 178 |
Other than measured at net asset value practical expedient | Significant Observable Inputs (Level 2) | Common/collective trust investment — fixed income | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | 256 | 230 |
Other than measured at net asset value practical expedient | Significant Observable Inputs (Level 2) | Short-term investment fund | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
Measured at net asset value practical expedient | Common/collective trust investment — non-U.S. equity | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | 70 | 94 |
Measured at net asset value practical expedient | Common/collective trust investment — fixed income | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | 249 | 233 |
Measured at net asset value practical expedient | Partnerships/joint ventures | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets | 25 | 42 |
Measured at net asset value practical expedient | Quoted Prices in Active Markets for Identical Assets (Level 1) | Common/collective trust investment — non-U.S. equity | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets |  |  |
Measured at net asset value practical expedient | Quoted Prices in Active Markets for Identical Assets (Level 1) | Common/collective trust investment — fixed income | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets |  |  |
Measured at net asset value practical expedient | Quoted Prices in Active Markets for Identical Assets (Level 1) | Partnerships/joint ventures | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets |  |  |
Measured at net asset value practical expedient | Significant Observable Inputs (Level 2) | Common/collective trust investment — non-U.S. equity | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets |  |  |
Measured at net asset value practical expedient | Significant Observable Inputs (Level 2) | Common/collective trust investment — fixed income | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets |  |  |
Measured at net asset value practical expedient | Significant Observable Inputs (Level 2) | Partnerships/joint ventures | Pension Benefits |  |  |
Benefit Plans and Other Postretirement Benefits |  |  |
Fair value of plan assets |  |  |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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