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Fair Value Measurements (Fair Value Hierarchy Classification) (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term borrowings | $ 682 | $ 601
Portion at Other than Fair Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term receivables | 149 | 127
Customer financing notes receivable | 428 | 437
Short-term borrowings | 682 | 601
Long-term debt (excluding capitalized leases) | 25,923 | 23,280
Long-term liabilities | 427 | 457
Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term receivables | 137 | 121
Customer financing notes receivable | 411 | 420
Short-term borrowings | 682 | 601
Long-term debt (excluding capitalized leases) | 28,019 | 25,110
Long-term liabilities | 395 | 427
Fair Value Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term receivables | 0 |
Customer financing notes receivable | 0 |
Short-term borrowings | 0 |
Long-term debt (excluding capitalized leases) | 0 |
Long-term liabilities | 0 |
Fair Value Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term receivables | 137 |
Customer financing notes receivable | 411 |
Short-term borrowings | 559 |
Long-term debt (excluding capitalized leases) | 27,863 |
Long-term liabilities | 395 |
Fair Value Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term receivables | 0 |
Customer financing notes receivable | 0 |
Short-term borrowings | 123 |
Long-term debt (excluding capitalized leases) | 156 |
Long-term liabilities | 0 |
Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 301 | 987
Derivative Assets | 168 | 170
Derivative Liabilities | 142 | 354
Fair Value, Measurements, Recurring [Member] | Fair Value Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 301 | 987
Derivative Assets | 0 | 0
Derivative Liabilities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 0 | 0
Derivative Assets | 168 | 170
Derivative Liabilities | 142 | 354
Fair Value, Measurements, Recurring [Member] | Fair Value Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 0 | 0
Derivative Assets | 0 | 0
Derivative Liabilities | $ 0 | $ 0

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