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Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | $ 1,600 | $ 2,150
Total assets | [1] | 159,422 | 171,797
Total liabilities |  | 1,024 | 691
Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 19,595 | 24,937
Total liabilities |  | 1,024 | 691
Government and agency debt - non-U.S. [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale securities, debt securities |  | 9,703 | 12,629
Corporate and Other [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale securities, debt securities | [2] | 5,878 | 7,823
Level 1 [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 1,260 | 1,523
Total liabilities |  | 0 | 0
Level 2 [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 18,335 | 23,414
Total liabilities |  | 1,024 | 691
Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 1,600 | 2,150
Available-for-sale securities, debt securities |  | 15,091 | 15,362
Total short-term investments |  | 16,691 | 17,512
Short-term Investments [Member] | Money market funds [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 1,571 | 2,115
Short-term Investments [Member] | Equity [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 29 | 35
Short-term Investments [Member] | Government and agency debt - non-U.S. [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale securities, debt securities |  | 9,609 | 12,242
Short-term Investments [Member] | Corporate and Other [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale securities, debt securities |  | 5,482 | 3,120
Short-term Investments [Member] | Level 1 [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 17 | 16
Available-for-sale securities, debt securities |  | 0 | 0
Total short-term investments |  | 17 | 16
Short-term Investments [Member] | Level 1 [Member] | Money market funds [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 0 | 0
Short-term Investments [Member] | Level 1 [Member] | Equity [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 17 | 16
Short-term Investments [Member] | Level 1 [Member] | Government and agency debt - non-U.S. [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale securities, debt securities |  | 0 | 0
Short-term Investments [Member] | Level 1 [Member] | Corporate and Other [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale securities, debt securities |  | 0 | 0
Short-term Investments [Member] | Level 2 [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 1,583 | 2,134
Available-for-sale securities, debt securities |  | 15,091 | 15,362
Total short-term investments |  | 16,674 | 17,496
Short-term Investments [Member] | Level 2 [Member] | Money market funds [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 1,571 | 2,115
Short-term Investments [Member] | Level 2 [Member] | Equity [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 11 | 19
Short-term Investments [Member] | Level 2 [Member] | Government and agency debt - non-U.S. [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale securities, debt securities |  | 9,609 | 12,242
Short-term Investments [Member] | Level 2 [Member] | Corporate and Other [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale securities, debt securities |  | 5,482 | 3,120
Other Current Assets [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative assets |  | 574 | 337
Other Current Assets [Member] | Recurring [Member] | Interest rate contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative assets |  | 97 | 104
Other Current Assets [Member] | Recurring [Member] | Foreign exchange contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative assets |  | 477 | 234
Other Current Assets [Member] | Level 1 [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative assets |  | 0 | 0
Other Current Assets [Member] | Level 1 [Member] | Recurring [Member] | Interest rate contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative assets |  | 0 | 0
Other Current Assets [Member] | Level 1 [Member] | Recurring [Member] | Foreign exchange contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative assets |  | 0 | 0
Other Current Assets [Member] | Level 2 [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative assets |  | 574 | 337
Other Current Assets [Member] | Level 2 [Member] | Recurring [Member] | Interest rate contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative assets |  | 97 | 104
Other Current Assets [Member] | Level 2 [Member] | Recurring [Member] | Foreign exchange contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative assets |  | 477 | 234
Long-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale securities, debt securities |  | 491 | 5,090
Trading funds and securities |  | 1,273 | 1,514
Total long-term investments |  | 1,764 | 6,603
Long-term Investments [Member] | Equity [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 1,223 | 1,440
Long-term Investments [Member] | Trading securities [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 50 | 73
Long-term Investments [Member] | Government and agency debt - non-U.S. [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale securities, debt securities |  | 94 | 387
Long-term Investments [Member] | Corporate and Other [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale securities, debt securities |  | 397 | 4,702
Long-term Investments [Member] | Level 1 [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale securities, debt securities |  | 0 | 36
Trading funds and securities |  | 1,243 | 1,472
Total long-term investments |  | 1,243 | 1,507
Long-term Investments [Member] | Level 1 [Member] | Equity [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 1,193 | 1,398
Long-term Investments [Member] | Level 1 [Member] | Trading securities [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 50 | 73
Long-term Investments [Member] | Level 1 [Member] | Government and agency debt - non-U.S. [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale securities, debt securities |  | 0 | 0
Long-term Investments [Member] | Level 1 [Member] | Corporate and Other [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale securities, debt securities |  | 0 | 36
Long-term Investments [Member] | Level 2 [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale securities, debt securities |  | 491 | 5,054
Trading funds and securities |  | 30 | 42
Total long-term investments |  | 521 | 5,096
Long-term Investments [Member] | Level 2 [Member] | Equity [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 30 | 42
Long-term Investments [Member] | Level 2 [Member] | Trading securities [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 0 | 0
Long-term Investments [Member] | Level 2 [Member] | Government and agency debt - non-U.S. [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale securities, debt securities |  | 94 | 387
Long-term Investments [Member] | Level 2 [Member] | Corporate and Other [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale securities, debt securities |  | 397 | 4,667
Other Noncurrent Assets [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative assets |  | 566 | 484
Other Noncurrent Assets [Member] | Recurring [Member] | Interest rate contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative assets |  | 335 | 477
Other Noncurrent Assets [Member] | Recurring [Member] | Foreign exchange contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative assets |  | 232 | 7
Other Noncurrent Assets [Member] | Level 1 [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative assets |  | 0 | 0
Other Noncurrent Assets [Member] | Level 1 [Member] | Recurring [Member] | Interest rate contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative assets |  | 0 | 0
Other Noncurrent Assets [Member] | Level 1 [Member] | Recurring [Member] | Foreign exchange contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative assets |  | 0 | 0
Other Noncurrent Assets [Member] | Level 2 [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative assets |  | 566 | 484
Other Noncurrent Assets [Member] | Level 2 [Member] | Recurring [Member] | Interest rate contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative assets |  | 335 | 477
Other Noncurrent Assets [Member] | Level 2 [Member] | Recurring [Member] | Foreign exchange contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative assets |  | 232 | 7
Other Current Liabilities [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative liabilities |  | 82 | 201
Other Current Liabilities [Member] | Recurring [Member] | Interest rate contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative liabilities |  | 5 | 1
Other Current Liabilities [Member] | Recurring [Member] | Foreign exchange contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative liabilities |  | 78 | 201
Other Current Liabilities [Member] | Level 1 [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative liabilities |  | 0 | 0
Other Current Liabilities [Member] | Level 1 [Member] | Recurring [Member] | Interest rate contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative liabilities |  | 0 | 0
Other Current Liabilities [Member] | Level 1 [Member] | Recurring [Member] | Foreign exchange contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative liabilities |  | 0 | 0
Other Current Liabilities [Member] | Level 2 [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative liabilities |  | 82 | 201
Other Current Liabilities [Member] | Level 2 [Member] | Recurring [Member] | Interest rate contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative liabilities |  | 5 | 1
Other Current Liabilities [Member] | Level 2 [Member] | Recurring [Member] | Foreign exchange contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative liabilities |  | 78 | 201
Other Noncurrent Liabilities [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative liabilities |  | 942 | 490
Other Noncurrent Liabilities [Member] | Recurring [Member] | Interest rate contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative liabilities |  | 378 | 177
Other Noncurrent Liabilities [Member] | Recurring [Member] | Foreign exchange contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative liabilities |  | 564 | 313
Other Noncurrent Liabilities [Member] | Level 1 [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative liabilities |  | 0 | 0
Other Noncurrent Liabilities [Member] | Level 1 [Member] | Recurring [Member] | Interest rate contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative liabilities |  | 0 | 0
Other Noncurrent Liabilities [Member] | Level 1 [Member] | Recurring [Member] | Foreign exchange contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative liabilities |  | 0 | 0
Other Noncurrent Liabilities [Member] | Level 2 [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative liabilities |  | 942 | 490
Other Noncurrent Liabilities [Member] | Level 2 [Member] | Recurring [Member] | Interest rate contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative liabilities |  | 378 | 177
Other Noncurrent Liabilities [Member] | Level 2 [Member] | Recurring [Member] | Foreign exchange contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative liabilities |  | $ 564 | $ 313
[1] | Amounts may not add due to rounding.
[2] | Primarily issued by a diverse group of corporations.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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