Derivative Financial Instruments - Cumulative Basis Adjustments for Fair Value Hedges (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Short-Term Debt
Amounts recorded in the Consolidated Balance Sheet related to cumulative basis adjustments for fair value hedges
Carrying amount of the hedged item	$ (2)	$ (199)
Cumulative hedging adjustments included in the carrying amount-assets/(liabilities)	(2)	1
Long-Term Debt
Amounts recorded in the Consolidated Balance Sheet related to cumulative basis adjustments for fair value hedges
Carrying amount of the hedged item	(6,376)	(6,216)
Cumulative hedging adjustments included in the carrying amount-assets/(liabilities)	312	72
Hedging adjustments on discontinued hedging relationships	$ (212)	$ (250)

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4EE
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4EE

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of liability hedged in fair value hedging relationship.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4EE
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4EE

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4EE
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4EE

+ Details

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Period Type:	instant

- References

No definition available.

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Period Type:	duration

- Details

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- Details

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