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Fair Value Measurements - Fair Value and Carrying Value of Long-Term Debt (Details) - Level 2 - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt (Including Current Maturities) | $ 17,299 | $ 19,439
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt (Including Current Maturities) | $ 16,336 | $ 16,366

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