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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment to opening retained earnings | $ (5,920) |  | $ (6,268)
Difference between Revenue Guidance in Effect before and after Topic 606 | ASU 2014-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment to opening retained earnings |  | $ 16 |

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