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Divestitures (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2021
Sep. 30, 2021
Business Acquisition and Divestitures [Line Items]    
Investment in affiliates   $ (22)
Proceeds from disposition of business   20
San Diego Shipyard    
Business Acquisition and Divestitures [Line Items]    
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value   83
Investment in affiliates   (22)
Oil and gas services    
Business Acquisition and Divestitures [Line Items]    
Proceeds from disposition of business   25
Gain on disposition of business $ 3 $ 1