Investment Securities (Contractual Maturity of Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 1,760
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	17,972
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	6,757
Available for Sale Securities, Amortized Cost, After 10 years	41,643
Securities available for sale debt securities, amortized cost	68,132	$ 63,514
Available-for-sale Securities, Fair value, 1 year or less	1,764
Available-for-sale Securities, Fair value, After 1 year through 5 years	18,145
Available-for-sale Securities, Fair value, After 5 years through 10 years	6,925
Available-for-sale Securities, Fair value, After 10 years	42,521
Available-for-sale Securities, Fair value, Total	$ 69,355	63,389
Weighted-average yield, GAAP basis, available for sale securities	2.99%
Held to Maturity Securities, Amortized Cost, 1 year or less	$ 31
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	769
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	1,810
Held to Maturity Securities, Amortized Cost, After 10 years	16,338
Held to Maturity Securities, Amortized Cost, Total	18,948	19,312
Held-to-maturity Securities, Fair Value, 1 year or less	31
Held-to-maturity Securities, Fair Value, After 1 year through 5 years	795
Held-to-maturity Securities, Fair Value, After 5 years through 10 years	1,900
Held-to-maturity Securities, Fair Value, After 10 years	16,473
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	$ 19,199	$ 19,019
Weighted-average yield, GAAP basis, held to maturity securities	3.34%
One Year or Less [Member]
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.38%
Weighted-average yield, GAAP basis, held to maturity securities	3.92%
After One Year Through Five Years [Member]
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.30%
Weighted-average yield, GAAP basis, held to maturity securities	3.89%
After Five Years Through Ten Years [Member]
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.95%
Weighted-average yield, GAAP basis, held to maturity securities	3.43%
After Ten Years [Member]
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	3.32%
Weighted-average yield, GAAP basis, held to maturity securities	3.30%
US Treasury and Government [Member]
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 1,273
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	13,501
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	3,232
Available for Sale Securities, Amortized Cost, After 10 years	822
Securities available for sale debt securities, amortized cost	18,828
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	493
Held to Maturity Securities, Amortized Cost, After 10 years	274
Held to Maturity Securities, Amortized Cost, Total	767
Residential Mortgage-backed Securities [Member] \| Mortgage-backed Securities Agency [Member]
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	1
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	67
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	853
Available for Sale Securities, Amortized Cost, After 10 years	32,587
Securities available for sale debt securities, amortized cost	33,508
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	68
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	507
Held to Maturity Securities, Amortized Cost, After 10 years	14,928
Held to Maturity Securities, Amortized Cost, Total	15,503
Residential Mortgage-backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member]
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, After 10 years	1,745
Securities available for sale debt securities, amortized cost	1,745
Held to Maturity Securities, Amortized Cost, After 10 years	146
Held to Maturity Securities, Amortized Cost, Total	146
Commercial Mortgage Backed Securities [Member] \| Mortgage-backed Securities Agency [Member]
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	626
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	268
Available for Sale Securities, Amortized Cost, After 10 years	1,674
Securities available for sale debt securities, amortized cost	2,568
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	46
Held to Maturity Securities, Amortized Cost, After 10 years	49
Held to Maturity Securities, Amortized Cost, Total	95
Commercial Mortgage Backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member]
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	337
Available for Sale Securities, Amortized Cost, After 10 years	2,640
Securities available for sale debt securities, amortized cost	2,977
Held to Maturity Securities, Amortized Cost, After 10 years	464
Held to Maturity Securities, Amortized Cost, Total	464
Asset backed [Member]
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	50
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	2,317
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	1,645
Available for Sale Securities, Amortized Cost, After 10 years	1,325
Securities available for sale debt securities, amortized cost	5,337
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	6
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	100
Held to Maturity Securities, Amortized Cost, After 10 years	64
Held to Maturity Securities, Amortized Cost, Total	170
Other [Member]
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	436
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	1,461
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	422
Available for Sale Securities, Amortized Cost, After 10 years	850
Securities available for sale debt securities, amortized cost	3,169
Held to Maturity Securities, Amortized Cost, 1 year or less	31
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	649
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	710
Held to Maturity Securities, Amortized Cost, After 10 years	413
Held to Maturity Securities, Amortized Cost, Total	$ 1,803

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

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-URI http://asc.fasb.org/extlink&oid=82897076&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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- 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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- Details

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