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Guarantees (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Guarantee Obligations [Line Items]    
Environmental, health and safety, tax and employment matters $ 120 $ 166
Balance as of January 1 1,033 929
Warranties and performance guarantees issued 311 444
Settlements (292) (330)
Other 5 (10)
Balance as of December 31 1,057 1,033
Commercial aerospace financing arrangements    
Guarantee Obligations [Line Items]    
Maximum Potential Payment 322 333
Carrying Amount of Liability 6 7
Partner Share of Guarantor Obligations, Maximum Exposure, Undiscounted 142 142
Performance Guarantees    
Guarantee Obligations [Line Items]    
Maximum Potential Payment 386 48
Carrying Amount of Liability $ 3 $ 0