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Fair Value of Financial Instruments - Additional Information (Details) - USD ($) $ in Billions | Jun. 30, 2019 | Dec. 31, 2018
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Fair Value Disclosures [Abstract] |  |
Shares held by ESOP | 78,138,603 | 78,172,809
Shares held by ESOP, redemption values | $ 2.9 | $ 1.9

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- Definition Redeemable equity common stock carrying amount. + References No definition available. + Details
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- Definition The shares or units in an ESOP trust that have been assigned to individual participant accounts based on a known formula. IRS rules require allocations to be nondiscriminatory generally based on compensation, length of service, or a combination of both. For any particular participant such shares or units may be vested, unvested, or partially vested. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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