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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle\
Operating lease ROU assets	$ 440
Operating lease liability	$ 445
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle\
Operating lease ROU assets		$ 442
Operating lease liability		$ 446
Minimum
New Accounting Pronouncements or Change in Accounting Principle\
Lease renewal options	1 year
Maximum
New Accounting Pronouncements or Change in Accounting Principle\
Lease renewal options	5 years

X

- Definition

Lessee, Lease, Renewal Term

+ References

No definition available.

+ Details

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- Definition

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

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