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Summary of Significant Accounting Policies - Summary of Recent Accounting Pronouncements (Details) - Accounting Standards Update 2018-02 $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Accumulated Other Comprehensive Loss
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification from AOCI, tax amount	$ (417)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification from AOCI, tax amount	$ 417

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- Definition

Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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