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Fair Value Measurements, Other Financial Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financial assets: |  |
Cash and cash equivalents, at carrying amount | $ 3,498 | $ 3,313
Financial liabilities: |  |
Debt (excluding finance leases), at carrying amount | 12,573 | 13,013
Fair Value, Inputs, Level 1 [Member] |  |
Financial assets: |  |
Cash and cash equivalents, at fair value | 3,498 | 3,313
Fair Value, Inputs, Level 2 [Member] |  |
Financial liabilities: |  |
Debt (excluding finance leases), at fair value | $ 14,574 | $ 15,103

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