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Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2021
Benefit Plans [Abstract] |
Components of Net Periodic (Benefit) Cost | The following table presents the components of net periodic (benefit) cost for the defined benefit plans:
|  | Pension Benefits |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
(In millions) |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 1 |  |  |  |  |  |  | $ | 2 |  |  | $ | 2 |
Interest cost |  |  | 17 |  |  | $ | 24 |  |  |  | 53 |  |  |  | 70 |
Expected return on plan assets |  |  | (41 | ) |  |  | (43 | ) |  |  | (127 | ) |  |  | (130 | )
Amortization of unrecognized net loss |  |  | 12 |  |  |  | 12 |  |  |  | 37 |  |  |  | 35 |
Amortization of unrecognized prior service cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Settlement charge |  |  |  |  |  |  | 1 |  |  |  | 2 |  |  |  | 8 |
Regulatory asset decrease |  |  | 1 |  |  |  |  |  |  |  | 1 |  |  |  |  |
Net periodic benefit |  | $ | (10 | ) |  | $ | (6 | ) |  | $ | (32 | ) |  | $ | (14 | )

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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