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Derivatives and Risk Management - Balance Sheet Location of Hedged Item (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Current maturities of long-term debt and finance leases
Derivative [Line Items]
Carrying amount of hedge instruments	$ (16)	$ (11)
Cumulative amount of fair value hedge adjustments	1	7
Long-term debt and finance leases
Derivative [Line Items]
Carrying amount of hedge instruments	(1,878)	(1,870)
Cumulative amount of fair value hedge adjustments	$ (25)	$ (8)

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Amount of liability hedged in fair value hedging relationship.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4EE
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4EE
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959

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