Trade Accounts Receivable, Unbilled Services and Unearned Income - Additional Information (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Dec. 31, 2025 |
|
| Receivables [Abstract] | ||||
| Unbilled receivables (percentage) | 75.00% | 75.00% | 71.00% | |
| Contract assets (percentage) | 25.00% | 25.00% | 29.00% | |
| Increase in unbilled services | $ (14) | |||
| Decrease in unearned income | 163 | |||
| Net change in balance | (177) | |||
| Trade accounts receivable | $ 367 | $ 330 | $ 367 | |
| Cash proceeds from trade accounts | $ 364 | $ 327 | ||