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Fair Value Measurements (Fair Value Hierarchy Classification) (Details) - USD ($)
$ in Millions
Jun. 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 $ 66 $ 74
Long-term debt (excluding finance leases) 41,828 43,546
Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities held in trusts 714 745
Derivative assets 204 308
Derivative liabilities 192 180
Customer financing notes receivable 57 63
Long-term debt (excluding finance leases) 38,542 41,598
Marketable securities held in trusts 714 745
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 650 682
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 204 308
Derivative liabilities 192 180
Customer financing notes receivable 57 63
Long-term debt (excluding finance leases) 35,250 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) $ 3,292 $ 4,039