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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Fair Value Measurements [Line Items]          
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) $ (545) $ (294) $ (800) $ (1,700)  
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ 780 $ 253 $ 1,400 $ 1,700  
Weighted Average [Member] | Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Inventory Related Payables [Member]          
Fair Value Measurements [Line Items]          
Basis 21.50%   21.50%   15.20%
Weighted Average [Member] | Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Inventories Carried At Market [Member]          
Fair Value Measurements [Line Items]          
Basis 21.70%   21.70%   19.40%