AFS and HTM Debt Securities, Delinquency Status and Nonaccrual (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Available For Sale And Held To Maturity Debt Securities Delinquency Status And Nonaccrual [Abstract]
Debt securities, available-for-sale and held-to-maturity, past due	$ 0	$ 0
Debt securities, available-for-sale, nonaccrual	327	110
Debt securities, held-to-maturity, nonaccrual	0	$ 0
Debt Securities, Held-to-maturity, Purchased with Credit Deterioration, Amount at Purchase Price	0
Debt Securities, Available-for-sale, Purchased with Credit Deterioration, Amount at Purchase Price [Abstract]
Par value	164
Allowance for credit losses at acquisition	(11)
Discount (or premiums) attributable to other factors	3
Purchase price of available-for-sale debt securities purchased with credit deterioration	$ 156

Amount of allowance for credit loss at acquisition date of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), purchased with credit deterioration.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 10
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922903-210455

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- Definition

Amount at par value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 10
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922903-210455

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- Definition

Amount at purchase price of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922903-210455

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- Definition

Amount of discount (premium) attributable to other factors on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 10
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922903-210455

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- References

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- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity) on nonaccrual status.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447

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- Definition

Amount at purchase price of investment in debt security measured at amortized cost (held-to-maturity), purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 19
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919265-210447

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- References

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Amount of investment in debt security measured at fair value (available-for-sale) on nonaccrual status.

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Amount of investment in debt security measured at fair value (available-for-sale) and at amortized cost (held-to-maturity), past due.

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