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Guarantees (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Product Warranty Liability [Line Items]      
Balance as of January 1 $ 1,057 $ 1,033  
Warranties and performance guarantees issued 176 149  
Settlements made (128) (154)  
Other (3) (20)  
Balance as of March 31 1,102 $ 1,008  
Commercial Aerospace Financing Arrangements      
Product Warranty Liability [Line Items]      
Maximum Potential Payment 314   $ 322
Carrying Amount of Liability 6   6
Guarantee Type, Other      
Product Warranty Liability [Line Items]      
Carrying Amount of Liability 116   120
third party guarantees      
Product Warranty Liability [Line Items]      
Maximum Potential Payment 386   386
Carrying Amount of Liability 2   3
Commercial Aerospace [Member]      
Product Warranty Liability [Line Items]      
Partner Share of Guarantor Obligations, Maximum Exposure, Undiscounted $ 144   $ 142