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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 | $ 2,364 | $ 1,469
Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term receivables | 344 | 334
Customer Financing Notes Receivable | 283 | 272
Short-term Debt | 2,364 | 1,469
Long-term debt (excluding capitalized leases) | 41,199 | 43,996
Long-term liabilities | 336 | 508
Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term receivables | 347 | 314
Customer Financing Notes Receivable | 283 | 265
Short-term Debt | 2,364 | 1,469
Long-term debt (excluding capitalized leases) | 46,202 | 44,003
Long-term liabilities | 322 | 467
Level 1 | Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term receivables | 0 | 0
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] |  |
Long-term receivables | 347 | 314
Customer Financing Notes Receivable | 283 | 265
Short-term Debt | 0 | 1,258
Long-term debt (excluding capitalized leases) | 45,802 | 43,620
Long-term liabilities | 322 | 467
Level 3 | Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term receivables | 0 | 0
Customer Financing Notes Receivable | 0 | 0
Short-term Debt | 2,364 | 211
Long-term debt (excluding capitalized leases) | 400 | 383
Long-term liabilities | $ 0 | $ 0

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