Stock-Based Compensation - General Employees Stock Purchase Plan (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Amounts recognized in the financial statements | |||
| Compensation expense | $ 263 | $ 274 | $ 262 |
| Employee Stock | |||
| Amounts recognized in the financial statements | |||
| Number of shares authorized (in shares) | 60 | ||
| Option price, percentage of market value at date of grant (as a percent) | 85.00% | ||
| Weighted-average fair value (in dollars per share) | $ 21.20 | $ 27.80 | $ 23.47 |
| Option price, discount from market value at date of grant (as a percent) | 15.00% | ||
| Compensation expense | $ 31 | $ 32 | $ 31 |