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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
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Change in Accounting Estimate [Line Items] |  |
Operating profit | $ 1,013 | $ 1,295
Income from continuing operations attributable to common shareowners | $ 772 | $ 438
Diluted earnings per share from continuing operations attributable to common shareholders (1) | $ 0.51 | $ 0.50
Contracts Accounted for under Percentage of Completion [Member] |  |
Change in Accounting Estimate [Line Items] |  |
Operating profit | $ 12 | $ 21
Income from continuing operations attributable to common shareowners | $ 9 | $ 16
Diluted earnings per share from continuing operations attributable to common shareholders (1) | $ 0.01 | $ 0.02

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