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Fair Value Measurements - Financial Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Carrying Value |  |
Financial Instruments |  |
Long-term debt, excluding current portion | $ 16,193 | $ 17,989
Fair Value |  |
Financial Instruments |  |
Long-term debt, excluding current portion | $ 17,836 | $ 20,496

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