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Fair Value Measurements (Fair Value Hierarchy Classification) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term borrowings | $ 1,111 | $ 1,469
Portion at Other than Fair Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term receivables | 580 | 334
Customer financing notes receivable | 288 | 272
Short-term borrowings | 1,111 | 1,469
Long-term debt (excluding finance leases) | 43,988 | 43,996
Long-term liabilities | 498 | 508
Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term receivables | 557 | 314
Customer financing notes receivable | 286 | 265
Short-term borrowings | 1,111 | 1,469
Long-term debt (excluding finance leases) | 45,643 | 44,003
Long-term liabilities | 465 | 467
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 | 0
Customer financing notes receivable | 0 | 0
Short-term borrowings | 0 | 0
Long-term debt (excluding finance leases) | 0 | 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 | 557 | 314
Customer financing notes receivable | 286 | 265
Short-term borrowings | 849 | 1,258
Long-term debt (excluding finance leases) | 45,213 | 43,620
Long-term liabilities | 465 | 467
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 | 0
Customer financing notes receivable | 0 | 0
Short-term borrowings | 262 | 211
Long-term debt (excluding finance leases) | 430 | 383
Long-term liabilities | 0 | 0
Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 55 | 51
Derivative Assets | 70 | 85
Derivative Liabilities | (201) | (286)
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 | 55 | 51
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 | 70 | 85
Derivative Liabilities | 201 | 286
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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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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