Progress Collections and Deferred Income (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Disaggregation of Revenue [Line Items] | ||
| Progress collections and deferred income (contract liabilities) | $ 2,870 | $ 1,765 |
| Revenue recognized, included in contract liability | 1,690 | 1,392 |
| Progress collections | ||
| Disaggregation of Revenue [Line Items] | ||
| Progress collections and deferred income (contract liabilities) | 2,760 | 1,600 |
| Deferred income | ||
| Disaggregation of Revenue [Line Items] | ||
| Progress collections and deferred income (contract liabilities) | $ 110 | $ 165 |