Investment Securities (Contractual Maturity of Debt Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 2,553
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	14,719
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	6,771
Available for Sale Securities, Amortized Cost, After 10 years	43,747
Securities available for sale debt securities, amortized cost	67,790	$ 63,514
Available-for-sale Securities, Fair value, 1 year or less	2,573
Available-for-sale Securities, Fair value, After 1 year through 5 years	14,881
Available-for-sale Securities, Fair value, After 5 years through 10 years	6,924
Available-for-sale Securities, Fair Value, After 10 years	44,785
Available-for-sale Securities, Fair Value	$ 69,163	63,389
Weighted-average yield, GAAP basis, available for sale securities	2.93%
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	$ 45
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	1,054
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	1,460
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	15,102
Held-to-maturity, debt securities	17,661	19,312
Held-to-maturity Securities, Fair Value, 1 year or less	45
Held-to-maturity Securities, Fair Value, After 1 year through 5 years	1,089
Held-to-maturity, Securities, Fair Value, After 5 through 10 years	1,543
Held-to-maturity, Securities, Fair Value, After 10 years	15,367
Debt Securities, Held-to-maturity, Fair Value	$ 18,044	$ 19,019
Weighted-average yield, GAAP basis, held to maturity securities	3.35%
One Year or Less
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.94%
Weighted-average yield, GAAP basis, held to maturity securities	3.75%
After One Year Through Five Years
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.28%
Weighted-average yield, GAAP basis, held to maturity securities	3.59%
After Five Years Through Ten Years
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.66%
Weighted-average yield, GAAP basis, held to maturity securities	3.53%
After Ten Years
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	3.19%
Weighted-average yield, GAAP basis, held to maturity securities	3.32%
US Treasury and Government Agencies Securities
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 2,198
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	10,189
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	2,984
Available for Sale Securities, Amortized Cost, After 10 years	779
Securities available for sale debt securities, amortized cost	16,150
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	198
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	300
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	278
Held-to-maturity, debt securities	776
Residential mortgage-backed Securities \| Mortgage-backed Securities Agency
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	2
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	65
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	1,194
Available for Sale Securities, Amortized Cost, After 10 years	34,586
Securities available for sale debt securities, amortized cost	35,847
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	55
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	516
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	13,848
Held-to-maturity, debt securities	14,419
Residential mortgage-backed Securities \| Mortgage-backed Securities Non-agency
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, After 10 years	1,515
Securities available for sale debt securities, amortized cost	1,515
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	133
Held-to-maturity, debt securities	133
Commercial Mortgage Backed Securities \| Mortgage-backed Securities Agency
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	8
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	565
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	490
Available for Sale Securities, Amortized Cost, After 10 years	2,031
Securities available for sale debt securities, amortized cost	3,094
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	10
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	49
Held-to-maturity, debt securities	59
Commercial Mortgage Backed Securities \| Mortgage-backed Securities Non-agency
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	75
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	350
Available for Sale Securities, Amortized Cost, After 10 years	2,927
Securities available for sale debt securities, amortized cost	3,352
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	430
Held-to-maturity, debt securities	430
Asset backed
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	8
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	2,511
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	1,267
Available for Sale Securities, Amortized Cost, After 10 years	1,258
Securities available for sale debt securities, amortized cost	5,044
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	6
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	19
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	27
Held-to-maturity, debt securities	52
Other debt
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	337
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	1,314
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	486
Available for Sale Securities, Amortized Cost, After 10 years	651
Securities available for sale debt securities, amortized cost	2,788
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	45
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	785
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	625
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	337
Held-to-maturity, debt securities	$ 1,792

Represents the weighted-average yield by maturity for debt securities available for sale.

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Represents the weighted-average yield by maturity for debt held to maturity.

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)(1)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803

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- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)(1)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

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+ References

No definition available.

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