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Fair Value Measurements (Fair Value Techniques) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term receivables | $ 127 | $ 127
Customer Financing Notes Receivable | 609 | 437
Short-term Debt | 392 | 600
Long-term debt (excluding capitalized leases) | 27,067 | 23,280
Long-term liabilities | 362 | 457
Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term receivables | 121 | 121
Customer Financing Notes Receivable | 596 | 420
Short-term Debt | 392 | 600
Long-term debt (excluding capitalized leases) | 29,180 | 25,110
Long-term liabilities | 330 | $ 427
Level 1 | Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term receivables | 0 |
Customer Financing Notes Receivable | 0 |
Short-term Debt | 0 |
Long-term debt (excluding capitalized leases) | 0 |
Long-term liabilities | 0 |
Level 2 | Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term receivables | 121 |
Customer Financing Notes Receivable | 596 |
Short-term Debt | 300 |
Long-term debt (excluding capitalized leases) | 28,970 |
Long-term liabilities | 330 |
Level 3 | Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term receivables | 0 |
Customer Financing Notes Receivable | 0 |
Short-term Debt | 92 |
Long-term debt (excluding capitalized leases) | 210 |
Long-term liabilities | $ 0 |

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- Definition This element is used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This element represents the fair value of long-term receivables. + References No definition available. + Details
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