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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | Jan. 01, 2018 | Oct. 01, 2017 | Jan. 01, 2017
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred taxes on income |  | $ 6,303 | $ 6,148
Retained earnings |  | $ 114,805 | $ 110,551
Minimum [Member] | Scenario, Forecast [Member] | Accounting Standards Update 2016-16 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred taxes on income | $ 2,200 |  |
Retained earnings | 1,200 |  |
Maximum [Member] | Scenario, Forecast [Member] | Accounting Standards Update 2016-16 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred taxes on income | 2,500 |  |
Retained earnings | $ 1,500 |  |

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