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Fair Value Measurements - Schedule of Fair Value and Carrying Value of Long-term Debt (Details) - Level 2 - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt (Including Current Maturities) | $ 19,439 | $ 21,076
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt (Including Current Maturities) | $ 16,366 | $ 16,705

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