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Fair Value Measurements (Fair Value Hierarchy Classification) (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term borrowings | $ 1,200 | $ 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 | 143 | 127
Customer financing notes receivable | 450 | 437
Short-term borrowings | 1,200 | 600
Long-term debt (excluding capitalized leases) | 23,361 | 23,280
Long-term liabilities | 433 | 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 | 134 | 121
Customer financing notes receivable | 428 | 420
Short-term borrowings | 1,200 | 600
Long-term debt (excluding capitalized leases) | 25,154 | 25,110
Long-term liabilities | 407 | 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 | 134 |
Customer financing notes receivable | 428 |
Short-term borrowings | 1,074 |
Long-term debt (excluding capitalized leases) | 24,975 |
Long-term liabilities | 407 |
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 | 126 |
Long-term debt (excluding capitalized leases) | 179 |
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 | 316 | 987
Derivative Assets | 106 | 170
Derivative Liabilities | 241 | 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 | 316 | 987
Derivative Assets | 2 | 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 | 104 | 170
Derivative Liabilities | 241 | 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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