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Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | $ 1,213 | $ 2,150
Total assets | [1] | 167,838 | 171,797
Total liabilities |  | 1,174 | 691
Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 18,866 | 24,937
Total liabilities |  | 1,174 | 691
Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 1,213 | 2,150
Available-for-sale debt securities |  | 11,256 | 15,362
Total short-term investments |  | 12,469 | 17,512
Other Current Assets [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative assets |  | 576 | 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 |  | 88 | 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 |  | 488 | 234
Long-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | [2] | 1,563 | 1,440
Available-for-sale debt securities |  | 3,742 | 5,090
Trading securities, debt |  | 50 | 73
Trading funds and securities |  | 1,612 | 1,514
Total long-term investments |  | 5,354 | 6,603
Other Noncurrent Assets [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative assets |  | 467 | 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 |  | 246 | 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 |  | 220 | 7
Other Current Liabilities [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative liabilities |  | 89 | 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 |  | 9 | 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 |  | 80 | 201
Other Noncurrent Liabilities [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative liabilities |  | 1,085 | 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 |  | 653 | 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 |  | 432 | 313
Level 1 [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 1,594 | 1,523
Total liabilities |  | 0 | 0
Level 1 [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 17 | 16
Available-for-sale debt securities |  | 0 | 0
Total short-term investments |  | 17 | 16
Level 1 [Member] | Other Current Assets [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative assets |  | 0 | 0
Level 1 [Member] | 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 |  | 0 | 0
Level 1 [Member] | 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 |  | 0 | 0
Level 1 [Member] | Long-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | [2] | 1,527 | 1,398
Available-for-sale debt securities |  | 0 | 36
Trading securities, debt |  | 50 | 73
Trading funds and securities |  | 1,577 | 1,472
Total long-term investments |  | 1,577 | 1,507
Level 1 [Member] | Other Noncurrent Assets [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative assets |  | 0 | 0
Level 1 [Member] | 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 |  | 0 | 0
Level 1 [Member] | 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 |  | 0 | 0
Level 1 [Member] | Other Current Liabilities [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative liabilities |  | 0 | 0
Level 1 [Member] | 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 |  | 0 | 0
Level 1 [Member] | 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 |  | 0 | 0
Level 1 [Member] | Other Noncurrent Liabilities [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative liabilities |  | 0 | 0
Level 1 [Member] | 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 |  | 0 | 0
Level 1 [Member] | 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 |  | 0 | 0
Level 2 [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 17,272 | 23,414
Total liabilities |  | 1,174 | 691
Level 2 [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 1,196 | 2,134
Available-for-sale debt securities |  | 11,256 | 15,362
Total short-term investments |  | 12,452 | 17,496
Level 2 [Member] | Other Current Assets [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative assets |  | 576 | 337
Level 2 [Member] | 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 |  | 88 | 104
Level 2 [Member] | 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 |  | 488 | 234
Level 2 [Member] | Long-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | [2] | 36 | 42
Available-for-sale debt securities |  | 3,742 | 5,054
Trading securities, debt |  | 0 | 0
Trading funds and securities |  | 36 | 42
Total long-term investments |  | 3,778 | 5,096
Level 2 [Member] | Other Noncurrent Assets [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative assets |  | 467 | 484
Level 2 [Member] | 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 |  | 246 | 477
Level 2 [Member] | 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 |  | 220 | 7
Level 2 [Member] | Other Current Liabilities [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Current derivative liabilities |  | 89 | 201
Level 2 [Member] | 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 |  | 9 | 1
Level 2 [Member] | 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 |  | 80 | 201
Level 2 [Member] | Other Noncurrent Liabilities [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Noncurrent derivative liabilities |  | 1,085 | 490
Level 2 [Member] | 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 |  | 653 | 177
Level 2 [Member] | 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 |  | 432 | 313
Money market funds [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 1,184 | 2,115
Money market funds [Member] | Level 1 [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 0 | 0
Money market funds [Member] | Level 2 [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 1,184 | 2,115
Equity [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | [2] | 29 | 35
Equity [Member] | Level 1 [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | [2] | 17 | 16
Equity [Member] | Level 2 [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | [2] | 12 | 19
Government and agency - non U.S. [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 8,442 | 12,629
Government and agency - non U.S. [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 8,336 | 12,242
Government and agency - non U.S. [Member] | Long-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 106 | 387
Government and agency - non U.S. [Member] | Level 1 [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Government and agency - non U.S. [Member] | Level 1 [Member] | Long-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Government and agency - non U.S. [Member] | Level 2 [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 8,336 | 12,242
Government and agency - non U.S. [Member] | Level 2 [Member] | Long-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 106 | 387
Corporate [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [3] | 6,100 | 6,938
Corporate [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 2,890 | 2,766
Corporate [Member] | Long-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 3,210 | 4,172
Corporate [Member] | Level 1 [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Corporate [Member] | Level 1 [Member] | Long-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 36
Corporate [Member] | Level 2 [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 2,890 | 2,766
Corporate [Member] | Level 2 [Member] | Long-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 3,210 | 4,136
Government - U.S. [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 428 | 747
Government - U.S. [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 8 | 252
Government - U.S. [Member] | Long-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 421 | 495
Government - U.S. [Member] | Level 1 [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Government - U.S. [Member] | Level 1 [Member] | Long-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Government - U.S. [Member] | Level 2 [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 8 | 252
Government - U.S. [Member] | Level 2 [Member] | Long-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 421 | 495
Agency asset-backed - U.S. [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 18 | 24
Agency asset-backed - U.S. [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 17 | 23
Agency asset-backed - U.S. [Member] | Level 1 [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Agency asset-backed - U.S. [Member] | Level 2 [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 17 | 23
Other asset-backed [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | [4] | 9 | 114
Other asset-backed [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 5 | 79
Other asset-backed [Member] | Long-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 4 | 35
Other asset-backed [Member] | Level 1 [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Other asset-backed [Member] | Level 1 [Member] | Long-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 0 | 0
Other asset-backed [Member] | Level 2 [Member] | Short-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | 5 | 79
Other asset-backed [Member] | Level 2 [Member] | Long-term Investments [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  | $ 4 | $ 35
[1] | Amounts may not add due to rounding.
[2] | As of September 30, 2018, short-term equity securities of $12 million and long-term equity securities of $35 million are held in trust for benefits attributable to the former Pharmacia Savings Plus Plan. As of December 31, 2017, short-term equity securities of $19 million and long-term equity securities of $42 million are held in trust for benefits attributable to the former Pharmacia Savings Plus Plan.
[3] | Issued by a diverse group of corporations.
[4] | Includes mortgage-backed, loan-backed and receivable-backed securities, all of which are in senior positions in the capital structure of the security. Mortgage-backed securities are collateralized by diversified pools of residential and commercial mortgages. Loan-backed securities are collateralized by senior secured obligations of a diverse pool of companies or student loans. Receivable-backed securities are collateralized by credit cards receivables.

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