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Guarantees (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Movement Warranties [Roll Forward]    
Balance as of January 1 $ 27 $ 47
Warranties 8 7
Settlements made (10) (16)
Other (1) (11)
Balance as of June 30 24 $ 27
Standby Letter of Credit    
Guarantor Obligations [Line Items]    
Guarantor obligation, maximum exposure $ 142