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Fair Value Measurements - Financial Assets and Liabilities at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Jan. 01, 2017
--- | --- | ---
Equity Securities |  |
Financial assets and liabilities at fair value |  |
Equity investments | $ 394 | $ 520
Unrealized Gain | 367 | 757
Unrealized loss | 10 | 68
Level 1 |  |
Financial assets and liabilities at fair value |  |
Equity method investments, fair market disclosure | 751 | 1,209
Debt securities | 0 |
Level 2 |  |
Financial assets and liabilities at fair value |  |
Equity method investments, fair market disclosure | 0 |
Debt securities | 5,310 | 12,087
Level 3 |  |
Financial assets and liabilities at fair value |  |
Equity method investments, fair market disclosure | 0 |
Debt securities | 0 |
Interest Rate Contract |  |
Financial assets and liabilities at fair value |  |
Non-current assets included in interest rate contracts | 7 | 23
Non-current liabilities included in interest rate contracts | 9 | 382
Equity Contract |  |
Financial assets and liabilities at fair value |  |
Derivative Instruments in Hedges, Liabilities, at Fair Value | 0 | 57
Equity Contract | Level 2 |  |
Financial assets and liabilities at fair value |  |
Derivative Instruments in Hedges, Liabilities, at Fair Value | 0 |
Designated as Hedging Instrument |  |
Financial assets and liabilities at fair value |  |
Derivative assets | 349 |
Derivative liabilities | 329 |
Designated as Hedging Instrument | Level 1 |  |
Financial assets and liabilities at fair value |  |
Derivative assets | 0 |
Derivative liabilities | 0 |
Designated as Hedging Instrument | Level 2 |  |
Financial assets and liabilities at fair value |  |
Derivative assets | 349 | 778
Derivative liabilities | 329 | 1,162
Designated as Hedging Instrument | Level 3 |  |
Financial assets and liabilities at fair value |  |
Derivative assets | 0 |
Derivative liabilities | 0 |
Designated as Hedging Instrument | Interest Rate Contract |  |
Financial assets and liabilities at fair value |  |
Derivative assets | 7 |
Derivative liabilities | 15 |
Designated as Hedging Instrument | Interest Rate Contract | Level 1 |  |
Financial assets and liabilities at fair value |  |
Derivative assets | 0 |
Derivative liabilities | 0 |
Designated as Hedging Instrument | Interest Rate Contract | Level 2 |  |
Financial assets and liabilities at fair value |  |
Derivative assets | 7 | 31
Derivative liabilities | 15 | 382
Designated as Hedging Instrument | Interest Rate Contract | Level 3 |  |
Financial assets and liabilities at fair value |  |
Derivative assets | 0 |
Derivative liabilities | 0 |
Designated as Hedging Instrument | Foreign exchange contracts |  |
Financial assets and liabilities at fair value |  |
Derivative assets | 342 |
Derivative liabilities | 314 |
Designated as Hedging Instrument | Foreign exchange contracts | Level 1 |  |
Financial assets and liabilities at fair value |  |
Derivative assets | 0 |
Derivative liabilities | 0 |
Designated as Hedging Instrument | Foreign exchange contracts | Level 2 |  |
Financial assets and liabilities at fair value |  |
Derivative assets | 342 | 747
Derivative liabilities | 314 | 723
Designated as Hedging Instrument | Foreign exchange contracts | Level 3 |  |
Financial assets and liabilities at fair value |  |
Derivative assets | 0 |
Derivative liabilities | 0 |
Not Designated as Hedging Instrument | Foreign exchange contracts |  |
Financial assets and liabilities at fair value |  |
Derivative assets | 38 |
Derivative liabilities | 38 |
Not Designated as Hedging Instrument | Foreign exchange contracts | Level 1 |  |
Financial assets and liabilities at fair value |  |
Derivative assets | 0 |
Derivative liabilities | 0 |
Not Designated as Hedging Instrument | Foreign exchange contracts | Level 2 |  |
Financial assets and liabilities at fair value |  |
Derivative assets | 38 | 34
Derivative liabilities | 38 | $ 57
Not Designated as Hedging Instrument | Foreign exchange contracts | Level 3 |  |
Financial assets and liabilities at fair value |  |
Derivative assets | 0 |
Derivative liabilities | $ 0 |

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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