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