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v3.20.2

Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2020
Retirement Benefits [Abstract] |
Company's pension and postretirement benefit plans |
Components of net cost (benefit) for pension and other postretirement plans |  |  |  |
|  | Three months ended June 30, |  | Six months ended June 30,
($ in millions) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Pension benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 25 |  |  | $ | 28 |  |  | $ | 53 |  |  | $ | 56 |
Interest cost |  | 56 |  |  | 62 |  |  | 112 |  |  | 127 |
Expected return on plan assets |  | (95 | ) |  | (101 | ) |  | (199 | ) |  | (194 | )
Amortization of prior service credit |  | (14 | ) |  | (14 | ) |  | (28 | ) |  | (28 | )
Costs and expenses |  | (28 | ) |  | (25 | ) |  | (62 | ) |  | (39 | )
Remeasurement of projected benefit obligation |  | 672 |  |  | 344 |  |  | 556 |  |  | 731 |
Remeasurement of plan assets |  | (623 | ) |  | (225 | ) |  | (189 | ) |  | (616 | )
Remeasurement (gains) losses |  | 49 |  |  | 119 |  |  | 367 |  |  | 115 |
Pension net cost |  | $ | 21 |  |  | $ | 94 |  |  | $ | 305 |  |  | $ | 76 |
Postretirement benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 2 |  |  | $ | 2 |  |  | $ | 3 |  |  | $ | 4 |
Interest cost |  | 3 |  |  | 3 |  |  | 6 |  |  | 7 |
Amortization of prior service credit |  | (1 | ) |  | (1 | ) |  | (2 | ) |  | (2 | )
Costs and expenses |  | 4 |  |  | 4 |  |  | 7 |  |  | 9 |
Remeasurement of projected benefit obligation |  | 24 |  |  | 6 |  |  | 24 |  |  | 25 |
Remeasurement of plan assets |  | — |  |  | — |  |  | — |  |  | — |
Remeasurement (gains) losses |  | 24 |  |  | 6 |  |  | 24 |  |  | 25 |
Postretirement net cost |  | $ | 28 |  |  | $ | 10 |  |  | $ | 31 |  |  | $ | 34 |
Pension and postretirement benefits |  |  |  |  |  |  |  |
Costs and expenses |  | $ | (24 | ) |  | $ | (21 | ) |  | $ | (55 | ) |  | $ | (30 | )
Remeasurement (gains) losses |  | 73 |  |  | 125 |  |  | 391 |  |  | 140 |
Total net cost |  | $ | 49 |  |  | $ | 104 |  |  | $ | 336 |  |  | $ | 110 |
D ifferences between expected and actual returns on plan assets and changes in assumptions affect the Company’s pension and other postretirement obligations, plan assets and expenses.
Pension and postretirement benefits remeasurement gains and losses |  |  |  |
|  | Three months ended June 30, |  | Six months ended June 30,
($ in millions) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Remeasurement of projected benefit obligation (gains) losses: |  |  |  |  |  |  |  |
Discount rate |  | $ | 433 |  |  | $ | 228 |  |  | $ | 397 |  |  | $ | 493 |
Other assumptions |  | 263 |  |  | 122 |  |  | 183 |  |  | 263 |
Remeasurement of plan assets (gains) losses |  | (623 | ) |  | (225 | ) |  | (189 | ) |  | (616 | )
Remeasurement (gains) losses |  | $ | 73 |  |  | $ | 125 |  |  | $ | 391 |  |  | $ | 140 |

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