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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 | Sep. 30, 2020 | Dec. 31, 2019
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Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |
Carrying Amount of the Hedged Asset (Liability) | [1] | $ (1,153) | $ (1,154)
Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged Assets (Liabilities) | [2] | $ (3) | $ (4)
[1] | Includes $(1.1) billion and $(397) million related to discontinued hedging relationships at September 30, 2020 and December 31, 2019, respectively.
[2] | Includes $(3) million and $3 million of hedging adjustments on discontinued hedging relationships at September 30, 2020 and December 31, 2019, respectively.

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