Fair Value Measurements (Fair Value Techniques) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Customer Financing Notes Receivable	$ 161	$ 192
Long-term debt (excluding capitalized leases)	28,049	35,828
Portion at Other than Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Customer Financing Notes Receivable	169	195
Long-term debt (excluding capitalized leases)	31,201	31,250
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	161	192
Long-term debt (excluding capitalized leases)	28,003	35,778
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)	$ 46	$ 50