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Fair Value Measurements (Fair Value Hierarchy Classification) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
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 $ 109 $ 74
Long-term debt (excluding finance leases) 41,846 43,546
Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities held in trusts 746 745
Derivative assets 402 308
Derivative liabilities 129 180
Customer financing notes receivable 104 63
Long-term debt (excluding finance leases) 40,562 41,598
Marketable securities held in trusts 746 745
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 682 682
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 64 63
Derivative assets 402 308
Derivative liabilities 129 180
Customer financing notes receivable 104 63
Long-term debt (excluding finance leases) 37,274 37,559
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) $ 3,288 $ 4,039