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Related Party Disclosures (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Related Party Transactions [Abstract]        
Revenue from related parties $ 4 $ 7 $ 9 $ 13
Purchases from related parties $ 9 $ 6 $ 16 $ 16