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Changes in Contract Estimates at Completion (Schedule of Change in Accounting Estimate) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |
Operating profit (loss) | $ 1,343 | $ 142 | $ 434 | $ (3,760) | $ 1,295 | $ 3,638 | $ (2,031) | $ (1,889)
Income (loss) from continuing operations attributable to common shareowners | $ 1,400 |  | $ 151 |  |  | $ 3,212 | $ (3,255) |
Diluted earnings (loss) per share from continuing operations attributable to common shareholders (1) | $ 0.93 |  | $ 0.10 |  |  | $ 2.13 | $ (2.48) |
Contracts Accounted for under Percentage of Completion [Member] |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |
Operating profit (loss) | $ 25 |  | $ (462) |  |  | $ 64 | $ (592) |
Income (loss) from continuing operations attributable to common shareowners | $ 20 |  | $ (365) |  |  | $ 51 | $ (468) |
Diluted earnings (loss) per share from continuing operations attributable to common shareholders (1) | $ 0.01 |  | $ (0.24) |  |  | $ 0.03 | $ (0.36) |

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