Trade Accounts Receivable, Unbilled Services and Unearned Income - Additional Information (Detail) - USD ($) $ in Millions |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Dec. 31, 2025 |
|
| Receivables [Abstract] | |||
| Unbilled receivables (percentage) | 73.00% | 71.00% | |
| Contract assets (percentage) | 27.00% | 29.00% | |
| Increase in unbilled services | $ (20) | ||
| Decrease in unearned income | 143 | ||
| Net change in balance | (163) | ||
| Trade accounts receivable | 182 | $ 167 | |
| Cash proceeds from trade accounts | $ 180 | $ 166 | |