Revenue Recognition - Performance Obligations Satisfied or Partially Satisfied in Prior Periods (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended |
---|---|---|
Sep. 30, 2021 |
Sep. 30, 2021 |
|
Revenue Recognition | ||
Impact to revenue from performance obligations satisfied (or partially satisfied) in previous periods | $ (49) | $ (85) |