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Derivative instruments (Hedged Liabilities and Cumulative Amount) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Cumulative amounts of fair value hedging adjustments related to the carrying amounts of the hedged liabilities	$ (343)	$ (437)
Current portion of long-term debt
Derivative [Line Items]
Hedged Liability, Fair Value Hedge	82	82
Cumulative amounts of fair value hedging adjustments related to the carrying amounts of the hedged liabilities	82	82
Carrying value with discontinued hedging relationships	82	82
Hedging adjustments on discontinued hedging relationships	82	82
Long-term debt
Derivative [Line Items]
Hedged Liability, Fair Value Hedge	6,112	6,017
Cumulative amounts of fair value hedging adjustments related to the carrying amounts of the hedged liabilities	(425)	(519)
Carrying value with discontinued hedging relationships	337	357
Hedging adjustments on discontinued hedging relationships	$ 237	$ 257

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Hedged Liability, Discontinued Fair Value Hedge

+ 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 https://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959

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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 https://asc.fasb.org/extlink&oid=125515794&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 https://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959

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