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Fair Value Measurements (Fair Value Hierarchy Classification) (Details) - USD ($)
$ in Millions
Jun. 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 $ 103 $ 169
Long-term debt (excluding finance leases) 34,180 31,201
Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities held in trusts 719 774
Derivative assets 239 84
Derivative liabilities 200 386
Customer financing notes receivable 99 161
Long-term debt (excluding finance leases) 31,583 28,049
Marketable securities held in trusts 719 774
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 658 713
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 61 61
Derivative assets 239 84
Derivative liabilities 200 386
Customer financing notes receivable 99 161
Long-term debt (excluding finance leases) 31,537 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) $ 46 $ 46