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U.S. and Europe Retrospective Responsibility Plan - Changes in the U.S. Litigation Escrow Account (Detail) - USD ($) $ in Millions |  | 6 Months Ended
--- | --- | ---
Dec. 27, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Escrow Account [Roll Forward] |  |  |
Beginning balance |  | $ 1,205 | $ 1,491
Return of takedown payment to the litigation escrow account | $ 467 | 467 | 0
Payments to class plaintiffs’ settlement fund |  | 0 | (600)
Ending balance |  | 1,264 | 899
Interest Income | Opt-out Merchants |  |  |
Escrow Account [Roll Forward] |  |  |
Payments to opt-out merchants and interest earned on escrow funds |  | $ (408) | $ 8

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