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Fair Value Measurements - Summary of Derivative Activity (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Oct. 01, 2017 | Sep. 30, 2018 | Oct. 01, 2017 | Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Unrealized gain (loss) arising during period | $ 262 | $ 62 | $ 37 | $ (8) |
Other (income) expense |  |  |  |  |
Summary of designated derivatives |  |  |  |  |
Gain/ (Loss) reclassified from Accumulated OCI into income | 0 | 0 | 0 | 0 |
Interest Rate Contract [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Notional Amount | 1,100 |  | 1,100 |  | $ 1,100
Foreign exchange contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Collateral Already Posted, Aggregate Fair Value | 153 |  | 153 |  |
Derivative, Notional Amount | 38,800 |  | 38,800 |  | 34,500
Cross currency interest rate swaps |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Notional Amount | 7,300 |  | 7,300 |  | $ 2,300
Fair Value Hedging | Interest Rate Contract [Member] | Sales to customers |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 | 0 | 0 |
Fair Value Hedging | Interest Rate Contract [Member] | Cost of products sold |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 | 0 | 0 |
Fair Value Hedging | Interest Rate Contract [Member] | Research and Development Expense |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 | 0 | 0 |
Fair Value Hedging | Interest Rate Contract [Member] | Investment Income (Expense) |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments |  |  |  | (6) |
Fair Value Hedging | Interest Rate Contract [Member] | Other (income) expense |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 | 0 | 0 |
Fair Value Hedging | Interest Rate Contract [Member] | Interest (income)/Interest expense, net |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | (7) | (4) | 3 |  |
Fair Value Hedging | Cross currency interest rate swaps | Sales to customers |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net | 0 | 0 | 0 | 0 |
Unrealized gain (loss) arising during period | 0 | 0 | 0 | 0 |
Fair Value Hedging | Cross currency interest rate swaps | Cost of products sold |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net | 0 | 0 | 0 | 0 |
Unrealized gain (loss) arising during period | 0 | 0 | 0 | 0 |
Fair Value Hedging | Cross currency interest rate swaps | Research and Development Expense |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net | 0 | 0 | 0 | 0 |
Unrealized gain (loss) arising during period | 0 | 0 | 0 | 0 |
Fair Value Hedging | Cross currency interest rate swaps | Other (income) expense |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net | 0 | 0 | 0 | 0 |
Unrealized gain (loss) arising during period | 0 | 0 | 0 | 0 |
Fair Value Hedging | Cross currency interest rate swaps | Interest (income)/Interest expense, net |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net | 25 | 0 | 27 | 0 |
Unrealized gain (loss) arising during period | 25 | 0 | 27 | 0 |
Fair Value Hedging | Designated as Hedging Instrument | Interest Rate Contract [Member] | Sales to customers |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 | 0 | 0 |
Fair Value Hedging | Designated as Hedging Instrument | Interest Rate Contract [Member] | Cost of products sold |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 | 0 | 0 |
Fair Value Hedging | Designated as Hedging Instrument | Interest Rate Contract [Member] | Research and Development Expense |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 | 0 | 0 |
Fair Value Hedging | Designated as Hedging Instrument | Interest Rate Contract [Member] | Investment Income (Expense) |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments |  |  |  | 6 |
Fair Value Hedging | Designated as Hedging Instrument | Interest Rate Contract [Member] | Other (income) expense |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 | 0 | 0 |
Fair Value Hedging | Designated as Hedging Instrument | Interest Rate Contract [Member] | Interest (income)/Interest expense, net |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 7 | 4 | (3) |  |
Cash Flow Hedging | Foreign exchange contracts | Sales to customers |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Unrealized gain (loss) arising during period | 15 | 18 | (3) | 40 |
Summary of designated derivatives |  |  |  |  |
Gain/ (Loss) reclassified from Accumulated OCI into income | 4 | 5 | 50 | (34) |
Cash Flow Hedging | Foreign exchange contracts | Cost of products sold |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Unrealized gain (loss) arising during period | 192 | (16) | 138 | 105 |
Summary of designated derivatives |  |  |  |  |
Gain/ (Loss) reclassified from Accumulated OCI into income | 97 | (63) | 175 | (162) |
Cash Flow Hedging | Foreign exchange contracts | Research and Development Expense |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Unrealized gain (loss) arising during period | (4) | (39) | (220) | (167) |
Summary of designated derivatives |  |  |  |  |
Gain/ (Loss) reclassified from Accumulated OCI into income | 10 | (30) | (242) | (131) |
Cash Flow Hedging | Foreign exchange contracts | Other (income) expense |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Unrealized gain (loss) arising during period | (1) | (15) | (16) | (59) |
Summary of designated derivatives |  |  |  |  |
Gain/ (Loss) reclassified from Accumulated OCI into income | (3) | (49) | (24) | (86) |
Cash Flow Hedging | Foreign exchange contracts | Interest (income)/Interest expense, net |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Unrealized gain (loss) arising during period | 0 | 0 | 0 | 0 |
Summary of designated derivatives |  |  |  |  |
Gain/ (Loss) reclassified from Accumulated OCI into income | 0 | 0 | 0 | 0 |
Cash Flow Hedging | Cross currency interest rate swaps | Sales to customers |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Unrealized gain (loss) arising during period | 0 | 0 | 0 | 0 |
Summary of designated derivatives |  |  |  |  |
Gain/ (Loss) reclassified from Accumulated OCI into income | 0 | 0 | 0 | 0 |
Cash Flow Hedging | Cross currency interest rate swaps | Cost of products sold |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Unrealized gain (loss) arising during period | 0 | 0 | 0 | 0 |
Summary of designated derivatives |  |  |  |  |
Gain/ (Loss) reclassified from Accumulated OCI into income | 0 |  | 0 | 0 |
Cash Flow Hedging | Cross currency interest rate swaps | Research and Development Expense |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Unrealized gain (loss) arising during period | 0 | 0 | 0 | 0 |
Summary of designated derivatives |  |  |  |  |
Gain/ (Loss) reclassified from Accumulated OCI into income | 0 | 0 | 0 | 0 |
Cash Flow Hedging | Cross currency interest rate swaps | Other (income) expense |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Unrealized gain (loss) arising during period | 0 | 0 | 0 | 0 |
Summary of designated derivatives |  |  |  |  |
Gain/ (Loss) reclassified from Accumulated OCI into income | 0 | 0 | 0 | 0 |
Cash Flow Hedging | Cross currency interest rate swaps | Interest (income)/Interest expense, net |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Unrealized gain (loss) arising during period | 35 | 114 | 111 | 73 |
Summary of designated derivatives |  |  |  |  |
Gain/ (Loss) reclassified from Accumulated OCI into income | $ 34 | $ 106 | $ 106 | $ 63 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959 + Details
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