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Derivatives and Hedge Accounting Activities (Schedule of Amounts Recorded on Balance Sheet Related to Cumulative Basis Adjustments for Fair Value Hedges) (Detail) - Designated as Hedging Instrument - Fair Value Hedging - Long-term Debt - USD ($)
$ in Millions

Dec. 31, 2019

Dec. 31, 2018

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Carrying Amount of the Hedged Asset (Liability)

^[1]

$ (1,154)

$ (1,631)

Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged (Liabilities)

^[2]

$ (4)

Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged Assets

$ 20

[1]	Includes $(397) million and $(892) million related to discontinued hedging relationships at December 31, 2019 and December 31, 2018, respectively.
[2]	Includes $3 million and $8 million of hedging adjustments on discontinued hedging relationships at December 31, 2019 and December 31, 2018, respectively.

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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 asset 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=109980867&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, 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=109980867&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 http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959

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