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Financial Instruments - Narrative (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) interest_rate_swap | Dec. 31, 2017 USD ($)
Derivative [Line Items] |  |
Number of interest rate swaps held (in interest rate swaps) | interest_rate_swap | 26 |
Pretax net unrealized loss on derivatives maturing within next 12 months estimated to be reclassified from AOCI to sales | $ 264,000,000 |
Equity investments without readily determinable fair values | 516,000,000 |
Unrealized gains of equity investments | 33,000,000 |
Impairment losses on investments | 8,000,000 |
Available-for-sale debt securities included in Short-term investments | 2,900,000,000 |
Available-for-sale debt securities maturing after one year through five years | 10,600,000,000 |
Cash and cash equivalents | 4,483,000,000 | $ 6,092,000,000
Fair value of loans payable and long-term debt, including current portion | 24,300,000,000 | 25,600,000,000
Carrying value of loans payable and long-term debt, including current portion | 23,600,000,000 | 24,400,000,000
Accounts receivable outstanding for more than one year | 80,000,000 |
Cash collateral received from counterparties | 0 | 3,000,000
Cash collateral advanced | 0 | $ 0
Significant Other Observable Inputs (Level 2) |  |
Derivative [Line Items] |  |
Cash and cash equivalents | 4,500,000,000 |
Cash equivalents | $ 3,500,000,000 |
Derivatives Designated as Hedging Instruments | Maximum |  |
Derivative [Line Items] |  |
Maximum average period of maturities of contracts in years (less than) | 2 years |
Derivatives Not Designated as Hedging Instruments | Maximum |  |
Derivative [Line Items] |  |
Maximum average period of maturities of contracts in years (less than) | 1 year |

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- Definition Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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