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Summary of Significant Accounting Policies - Schedule of Cumulative Effect Adjustments (Details) - Retained Earnings $ in Millions	Jan. 01, 2018 USD ($)
Adjustments for New Accounting Pronouncement
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment	$ 1,496
ASU 2014-09 - Revenue from Contracts with Customers
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment	(47)
ASU 2016-01 - Financial Instruments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment	232
ASU 2016-16 - Income Taxes: Intra-Entity Transfers
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment	$ 1,311

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