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Selected Balance Sheet Data Selected Balance Sheet Data, Accounts Receivable (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract]    
Accounts receivable $ 1,339 $ 1,443
Less allowance for bad debts (119) (128)
Accounts receivable, net $ 1,220 $ 1,315