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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Fair Value Measurements [Line Items]          
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) $ (297) $ (394) $ (1,100) $ (2,100)  
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ 438 $ 481 $ 1,800 $ 2,200  
Weighted Average [Member] | Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Inventory Related Payables [Member]          
Fair Value Measurements [Line Items]          
Basis 47.30%   47.30%   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 28.10%   28.10%   19.40%