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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Oct. 01, 2017 | Sep. 30, 2018 | Oct. 01, 2017 | Dec. 31, 2017 | Jan. 01, 2018
Derivative [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Equity Securities | $ 697 |  | $ 697 |  | $ 751 |
Accumulated other comprehensive income on derivatives, after tax | 16 |  | $ 16 |  |  |
Reclassification of foreign exchange contracts into earnings, period |  |  | next 12 months |  |  |
Maximum length of time for hedge exposure |  |  | 18 months |  |  |
Unrealized gains on equity investments | $ 0 | $ 14 | $ 0 | $ 150 |  |
Weighted average interest rate on non-current debt | 3.20% |  | 3.20% |  |  |
Excess of the estimated fair value over the carrying value of debt |  |  |  |  | 2,000 |
Foreign exchange contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Collateral Already Posted, Aggregate Fair Value | $ 153 |  | $ 153 |  |  |
Derivative notional amounts outstanding | 38,800 |  | 38,800 |  | 34,500 |
Cross currency interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative notional amounts outstanding | 7,300 |  | 7,300 |  | 2,300 |
Interest Rate Contract [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative Liability, Noncurrent | 6 |  | 6 |  | 9 |
Derivative notional amounts outstanding | 1,100 |  | 1,100 |  | 1,100 |
Equity Securities |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Equity Securities | $ 697 |  | 697 |  | $ 751 |
Equity Investments without readily determinable value | Equity Securities |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Equity, Fair Value Adjustment, Impairment Loss |  |  | (31) |  |  |
Changes in fair value, changes in observable prices |  |  | $ 38 |  |  |
Equity Investments with readily determinable value | Equity Securities |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Unrealized gains on equity investments |  |  |  | $ 269 |  |
Retained Earnings | ASU 2016-01 - Financial Instruments |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Cumulative effect adjustment |  |  |  |  |  | $ 232

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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + Details
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