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Financial Instruments - Reconciliation of Recurring Level 3 Fair Value Measurements (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 8 $ 30
Proceeds at maturity (1) (22)
Ending balance $ 7 $ 8