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Summary of Significant Accounting Policies Adjustments for New Accounting Pronouncement Related to ASU 2014-09 (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($)
Accounting Standards Update 2014-09 [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 6,100,000,000.0

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