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Employee Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2021
Retirement Benefits [Abstract] |
Schedule of Components of Expense/(Income) Related to Net Benefit Expense |
| Pension Benefits Cost
| First Quarters |  |
(Dollars in millions) | 2021 |  | 2020 |  |  |  |
Service Cost Included in Labor and Fringe | $ | 9 |  |  | $ | 10 |  |  |  |  |
Interest Cost | 14 |  |  | 20 |  |  |  |  |
Expected Return on Plan Assets | (46) |  |  | (43) |  |  |  |  |
Amortization of Net Loss | 18 |  |  | 14 |  |  |  |  |
Total Included in Other Income - Net | (14) |  |  | (9) |  |  |  |  |
Net Periodic Benefit (Credit)/Cost | $ | (5) |  |  | $ | 1 |  |  |  |  |
| Other Post-retirement Benefits Cost
| First Quarters |  |
(Dollars in millions) | 2021 |  | 2020 |  |  |  |
Service Cost Included in Labor and Fringe | $ | — |  |  | $ | — |  |  |  |  |
Interest Cost | — |  |  | 1 |  |  |  |  |
Amortization of Prior Service Credits | (1) |  |  | (2) |  |  |  |  |
Total Included in Other Income - Net | (1) |  |  | (1) |  |  |  |  |
Net Periodic Benefit Credit | $ | (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 http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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