Fair Value Measurements (Fair Value Techniques) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Customer Financing Notes Receivable	$ 63	$ 161
Long-term debt (excluding capitalized leases)	41,598	28,049
Portion at Other than Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Customer Financing Notes Receivable	74	169
Long-term debt (excluding capitalized leases)	43,546	31,201
Level 1 | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Customer Financing Notes Receivable	0	0
Long-term debt (excluding capitalized leases)	0	0
Level 2 | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Customer Financing Notes Receivable	63	161
Long-term debt (excluding capitalized leases)	37,559	28,003
Level 3 | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Customer Financing Notes Receivable	0	0
Long-term debt (excluding capitalized leases)	$ 4,039	$ 46