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Revenue (Deferred Revenue Activity) (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Contract Liability [Roll Forward] |  |
Beginning Balance | $ 138 | $ 106
Increases due to cash received or receivable, excluding amounts recognized as revenue during the period | 180 | 143
Revenue recognized that was included in the deferred revenue balance at the beginning of the period | (53) | (34)
Ending Balance | $ 265 | $ 215

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