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Fair Value Measurements (Fair Value Hierarchy Classification) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
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 $ 88 $ 169
Long-term debt (excluding finance leases) 33,995 31,201
Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities held in trusts 737 774
Derivative assets 151 84
Derivative liabilities 274 386
Customer financing notes receivable 82 161
Long-term debt (excluding finance leases) 29,125 28,049
Marketable securities held in trusts 737 774
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 675 713
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 62 61
Derivative assets 151 84
Derivative liabilities 274 386
Customer financing notes receivable 82 161
Long-term debt (excluding finance leases) 29,080 28,003
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) $ 45 $ 46