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Leases Lessee Disclosure - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Supplemental Disclosure of Cash Flow Information
Operating cash flows from operating leases	$ 43
Operating cash flows from finance leases	0
Financing cash flows from finance leases	4
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	13
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 5	$ 4

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- Definition

Amount of interest paid on finance lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(1)
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Amount of cash outflow for principal payment on finance lease.

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-Name Accounting Standards Codification
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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 45
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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