Expenses - Restructuring Reserve (Details) - USD ($) $ in Millions |
3 Months Ended | |||
|---|---|---|---|---|
Jun. 30, 2025 |
Mar. 31, 2025 |
Jun. 30, 2024 |
Mar. 31, 2024 |
|
| Restructuring Reserve [Roll Forward] | ||||
| Beginning balance | $ 82 | $ 96 | $ 189 | $ 208 |
| Payments and other adjustments | (19) | (14) | (37) | (19) |
| Accruals for repositioning charges | 100 | |||
| Ending balance | 163 | 82 | 152 | 189 |
| Employee Related Costs | ||||
| Restructuring Reserve [Roll Forward] | ||||
| Beginning balance | 82 | 96 | 188 | 207 |
| Payments and other adjustments | (19) | (14) | (37) | (19) |
| Accruals for repositioning charges | 100 | |||
| Ending balance | 163 | 82 | 151 | 188 |
| Real Estate Actions | ||||
| Restructuring Reserve [Roll Forward] | ||||
| Beginning balance | 0 | 0 | 1 | 1 |
| Payments and other adjustments | 0 | 0 | 0 | 0 |
| Accruals for repositioning charges | 0 | |||
| Ending balance | $ 0 | $ 0 | $ 1 | $ 1 |