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Fair Value Measurements (Fair Value Hierarchy Classification) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Portion at Other than Fair Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Customer financing notes receivable | $ 313 | $ 271
Short-term borrowings | (234) | (247)
Long-term debt (excluding finance leases) | (31,200) | (31,512)
Long-term liabilities | (28) | (27)
Marketable securities held in trusts | 879 | 881
Short-term borrowings | (234) | (247)
Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities held in trusts |  | 881
Derivative assets | 193 | 241
Derivative liabilities | (167) | (98)
Customer financing notes receivable | 303 | 264
Short-term borrowings | (234) | (247)
Long-term debt (excluding finance leases) | (35,633) | (38,615)
Long-term liabilities | (27) | (25)
Fair Value Level 1 [Member] | Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities held in trusts | 813 | 773
Derivative assets | 0 | 0
Derivative liabilities | 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 | 0
Fair Value Level 2 [Member] | Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities held in trusts | 66 | 108
Derivative assets | 193 | 241
Derivative liabilities | (167) | (98)
Customer financing notes receivable | 303 | 264
Short-term borrowings | (160) | (160)
Long-term debt (excluding finance leases) | (35,559) | (38,540)
Long-term liabilities | (27) | (25)
Fair Value Level 3 [Member] | Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities held in trusts | 0 | 0
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Customer financing notes receivable | 0 | 0
Short-term borrowings | (74) | (87)
Long-term debt (excluding finance leases) | (74) | (75)
Long-term liabilities | $ 0 | $ 0

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- Definition This element is used in connection with the recurring fair value measurement disclosures required in the footnote disclosures to the financial statements. This element represents the fair value of other long-term liabilities. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other 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 assets 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 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 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=121572278&loc=d3e13433-108611 Reference 3: 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 + Details
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