| | | | | | | | | | | |
| Post-retirement plans | Derivatives designated as cash flow hedges | Total |
Balance at March 31, 2022 | $ | 9 | | $ | — | | $ | 9 | |
| OCI, before reclassifications to earnings and income taxes | 15 | | 15 | | 30 | |
| Income taxes | (4) | | (4) | | (8) | |
| OCI before reclassifications to earnings, net of income taxes | 11 | | 11 | | 22 | |
| Amounts reclassified from AOCI to earnings, before income taxes | — | | (1) | | (1) | |
| Income taxes | — | | — | | — | |
Amounts reclassified from AOCI to earnings, net of income taxes(1) | — | | (1) | | (1) | |
| Current-period OCI, net of income taxes | 11 | | 10 | | 21 | |
Balance at March 31, 2023 | $ | 20 | | $ | 10 | | $ | 30 | |
| OCI, before reclassifications to earnings and income taxes | (21) | | 12 | | (9) | |
| Income taxes | 4 | | (3) | | 1 | |
| OCI before reclassifications to earnings, net of income taxes | (17) | | 9 | | (8) | |
| Amounts reclassified from AOCI to earnings, before income taxes | (2) | | (15) | | (17) | |
| Income taxes | 1 | | 4 | | 5 | |
Amounts reclassified from AOCI to earnings, net of income taxes(1) | (1) | | (11) | | (12) | |
| Current-period OCI, net of income taxes | (18) | | (2) | | (20) | |
Balance at March 31, 2024 | $ | 2 | | $ | 8 | | $ | 10 | |
| OCI, before reclassifications to earnings and income taxes | (42) | | (2) | | (44) | |
| Income taxes | 11 | | 1 | | 12 | |
| OCI before reclassifications to earnings, net of income taxes | (31) | | (1) | | (32) | |
Amounts reclassified from AOCI to earnings, before income taxes (1) | 1 | | (10) | | (9) | |
| Income taxes | — | | 2 | | 2 | |
| Amounts reclassified from AOCI to earnings, net of income taxes | 1 | | (8) | | (7) | |
| Current-period OCI, net of income taxes | (30) | | (9) | | (39) | |
Balance at March 31, 2025 | $ | (28) | | $ | (1) | | $ | (29) | |