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Derivative Financial Instruments and Hedging Activities (Schedule of Fair Value Hedging Basis Adjustments) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Asset, Fair Value, Portfolio Layer, Amount	$ 5,800	$ 5,800
Closed Portfolio and Beneficial Interest, Portfolio Layer, Amortized Cost	8,300	9,100
Designated as Hedging Item [Member] | Debt Available-for-sale Securities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Asset, Fair Value Hedge	9,076	9,901
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	(36)	0
Designated as Hedging Item [Member] | Long-term Debt [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Liability, Fair Value Hedge	(1,275)	(1,363)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	$ 122	$ 34

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Amount of asset 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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+ 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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-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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+ References

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-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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