Derivatives and Risk Management - Balance Sheet Location of Hedged Item (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Cumulative amount of adjustments remaining for which hedge accounting has been discontinued	$ 76
Current maturities of debt and finance leases
Derivative [Line Items]
Carrying amount of hedge instruments	21	$ (19)
Cumulative amount of fair value hedge adjustments	21	8
Debt and finance leases
Derivative [Line Items]
Carrying amount of hedge instruments	(72)	(1,783)
Cumulative amount of fair value hedge adjustments	$ 77	$ 53

Carrying Amount Of Hedged Instruments, Fair Value Hedge, Net

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- 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.

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- Definition

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

+ 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 (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109999712-113959

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- 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=121590274&loc=SL109999712-113959

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