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Investments - Pre-tax (Losses)/Gains for Marketable Securities (Details) - KDP - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Schedule of Investments [Line Items]    
Gain on marketable securities sold during the period $ 0 $ 593
Dividend income and other (1) 13
Total (loss)/gain on marketable securities $ (1) $ 606