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Pension and Other Postretirement Benefits (Tables) | 6 Months Ended
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Jun. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Schedule of Net Periodic Pension Cost | Net periodic pension cost (credit) includes the following components:
| Qualified Plans |  | Non-qualified Plans |  | Total
| Three Months Ended June 30
| 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
| (In millions)
Service cost | $ | 10 |  |  | $ | 8 |  |  | $ | 2 |  |  | $ | 1 |  |  | $ | 12 |  |  | $ | 9 |
Interest cost | 12 |  |  | 16 |  |  | — |  |  | 1 |  |  | 12 |  |  | 17 |
Expected return on plan assets | (36) |  |  | (38) |  |  | — |  |  | — |  |  | (36) |  |  | (38) |
Amortization of actuarial loss | 12 |  |  | 11 |  |  | 2 |  |  | 1 |  |  | 14 |  |  | 12 |
Net periodic pension cost (credit) | $ | (2) |  |  | $ | (3) |  |  | $ | 4 |  |  | $ | 3 |  |  | $ | 2 |  |  | $ | — |
| Qualified Plans |  | Non-qualified Plans |  | Total
| Six Months Ended June 30
| 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
| (In millions)
Service cost | $ | 19 |  |  | $ | 17 |  |  | $ | 3 |  |  | $ | 2 |  |  | $ | 22 |  |  | $ | 19 |
Interest cost | 24 |  |  | 32 |  |  | 1 |  |  | 2 |  |  | 25 |  |  | 34 |
Expected return on plan assets | (71) |  |  | (75) |  |  | — |  |  | — |  |  | (71) |  |  | (75) |
Amortization of actuarial loss | 23 |  |  | 20 |  |  | 4 |  |  | 3 |  |  | 27 |  |  | 23 |
Net periodic pension cost (credit) | $ | (5) |  |  | $ | (6) |  |  | $ | 8 |  |  | $ | 7 |  |  | $ | 3 |  |  | $ | 1 |

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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=118255775&loc=d3e1928-114920 + Details
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