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Fair Value Measurements (Fair Value Hierarchy Classification) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Portion at Other than Fair Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Customer financing notes receivable | $ 183 | $ 195
Long-term debt (excluding finance leases) | 31,161 | 31,250
Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities held in trusts | 740 | 965
Derivative assets | 60 | 70
Derivative liabilities | 706 | 213
Customer financing notes receivable | 174 | 192
Long-term debt (excluding finance leases) | 27,277 | 35,828
Marketable securities held in trusts | 740 | 965
Fair Value Level 1 [Member] | Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities held in trusts | 682 | 890
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Customer financing notes receivable | 0 | 0
Long-term debt (excluding finance leases) | 0 | 0
Fair Value Level 2 [Member] | Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities held in trusts | 58 | 75
Derivative assets | 60 | 70
Derivative liabilities | 706 | 213
Customer financing notes receivable | 174 | 192
Long-term debt (excluding finance leases) | 27,230 | 35,778
Fair Value Level 3 [Member] | Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities held in trusts | 0 | 0
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Customer financing notes receivable | 0 | 0
Long-term debt (excluding finance leases) | $ 47 | $ 50

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