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Summary of Significant Accounting Policies - Pension Plan Contributions (Details) $ in Millions	Mar. 31, 2020 USD ($)
Accounting Policies [Abstract]
Pension plan employer contributions deferred until 2021	$ 47

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- References

No definition available.

+ Details

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- Definition

Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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