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Fair Value Measurements (Fair Value Hierarchy Classification) (Details) - USD ($) $ in Millions | Mar. 31, 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 | $ 195 | $ 195
Long-term debt (excluding finance leases) | (31,233) | (31,250)
Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities held in trusts | 857 | 965
Derivative assets | 117 | 70
Derivative liabilities | (226) | (213)
Customer financing notes receivable | 187 | 192
Long-term debt (excluding finance leases) | (32,566) | (35,828)
Marketable securities held in trusts | 857 | 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 | 783 | 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 | 74 | 75
Derivative assets | 117 | 70
Derivative liabilities | (226) | (213)
Customer financing notes receivable | 187 | 192
Long-term debt (excluding finance leases) | (32,516) | (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) | $ (50) | $ (50)

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