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Employee Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Components of Net Periodic Benefit Cost | The components of net periodic benefit cost (credit) for the Corporation's qualified pension plan, non-qualified pension plan and postretirement benefit plan are as follows.
Qualified Defined Benefit Pension Plan | Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $ | 10 |  |  | $ | 9 |  |  | $ | 19 |  |  | $ | 19 |
Other components of net benefit credit: |  |  |  |  |  |  |
Interest cost | 15 |  |  | 15 |  |  | 31 |  |  | 30 |
Expected return on plan assets | (50) |  |  | (51) |  |  | (100) |  |  | (101) |
Amortization of prior service credit | (3) |  |  | (4) |  |  | (7) |  |  | (9) |
Amortization of net loss | 5 |  |  | 8 |  |  | 10 |  |  | 15 |
Total other components of net benefit credit | (33) |  |  | (32) |  |  | (66) |  |  | (65) |
Net periodic defined benefit credit | $ | (23) |  |  | $ | (23) |  |  | $ | (47) |  |  | $ | (46) |
Non-Qualified Defined Benefit Pension Plan | Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $ | — |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |
Other components of net benefit cost: |  |  |  |  |  |  |
Interest cost | 2 |  |  | 1 |  |  | 3 |  |  | 3 |
Amortization of prior service credit | (3) |  |  | (2) |  |  | (5) |  |  | (3) |
Amortization of net loss | 2 |  |  | 2 |  |  | 4 |  |  | 5 |
Total other components of net benefit cost | 1 |  |  | 1 |  |  | 2 |  |  | 5 |
Net periodic defined benefit cost | $ | 1 |  |  | $ | 2 |  |  | $ | 3 |  |  | $ | 6 |
Postretirement Benefit Plan | Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) | 2022 |  | 2021 |  | 2022 |  | 2021
Other components of net benefit credit: |  |  |  |  |  |  |
Expected return on plan assets | $ | (1) |  |  | $ | — |  |  | (1) |  |  | (1) |
Net periodic defined benefit credit | $ | (1) |  |  | $ | — |  |  | $ | (1) |  |  | $ | (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 https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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