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Fair Value Measurements (Fair Value Techniques) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term Debt | $ 2,293 | $ 1,428
Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Customer Financing Notes Receivable | 220 | 226
Short-term Debt | 2,293 | 1,428
Long-term debt (excluding capitalized leases) | 40,883 | 43,703
Long-term liabilities | 334 | 505
Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Customer Financing Notes Receivable | 220 | 219
Short-term Debt | 2,293 | 1,428
Long-term debt (excluding capitalized leases) | 45,887 | 43,710
Long-term liabilities | 320 | 464
Level 1 | Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Customer Financing Notes Receivable | 0 | 0
Short-term Debt | 0 | 0
Long-term debt (excluding capitalized leases) | 0 | 0
Long-term liabilities | 0 | 0
Level 2 | Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Customer Financing Notes Receivable | 220 | 219
Short-term Debt | 0 | 1,258
Long-term debt (excluding capitalized leases) | 45,802 | 43,620
Long-term liabilities | 320 | 464
Level 3 | Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Customer Financing Notes Receivable | 0 | 0
Short-term Debt | 2,293 | 170
Long-term debt (excluding capitalized leases) | 85 | 90
Long-term liabilities | $ 0 | $ 0

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