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Cash and Equivalents (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Cash and Cash Equivalents [Line Items]    
Cash and equivalents $ 483 $ 436
Operating cash and equivalents    
Cash and Cash Equivalents [Line Items]    
Cash and equivalents 340 282
Short-term investments    
Cash and Cash Equivalents [Line Items]    
Cash and equivalents 12 3
Cash and equivalents held in consolidated joint ventures and Aspire Defence subcontracting entities    
Cash and Cash Equivalents [Line Items]    
Cash and equivalents 131 151
International    
Cash and Cash Equivalents [Line Items]    
Cash and equivalents 388 382
International | Operating cash and equivalents    
Cash and Cash Equivalents [Line Items]    
Cash and equivalents 245 228
International | Short-term investments    
Cash and Cash Equivalents [Line Items]    
Cash and equivalents 12 3
International | Cash and equivalents held in consolidated joint ventures and Aspire Defence subcontracting entities    
Cash and Cash Equivalents [Line Items]    
Cash and equivalents 131 151
Domestic    
Cash and Cash Equivalents [Line Items]    
Cash and equivalents 95 54
Domestic | Operating cash and equivalents    
Cash and Cash Equivalents [Line Items]    
Cash and equivalents 95 54
Domestic | Short-term investments    
Cash and Cash Equivalents [Line Items]    
Cash and equivalents 0 0
Domestic | Cash and equivalents held in consolidated joint ventures and Aspire Defence subcontracting entities    
Cash and Cash Equivalents [Line Items]    
Cash and equivalents $ 0 $ 0