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Summary of Significant Accounting Policies - Recent Accounting Developments - Guidance Adopted in 2017 (Details) - Subsequent Event - ASU 2016-02	Jan. 01, 2019 USD ($)
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liability	$ 380,000,000
Right-of-use assets	300,000,000
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liability	420,000,000
Right-of-use assets	$ 340,000,000

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+ References

No definition available.

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
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