Revenue from Contracts with Customers - Remaining Performance Obligations, Backlog Schedule (Details) - USD ($) $ in Millions |
Dec. 31, 2021 |
Dec. 31, 2020 |
---|---|---|
Revenue from Contract with Customer [Abstract] | ||
Funded | $ 2,510 | $ 2,847 |
Unfunded | 351 | 444 |
Total Backlog | $ 2,861 | $ 3,291 |