Investment Securities (Contractual Maturity of Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 1,188
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	18,292
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	7,394
Available for Sale Securities, Amortized Cost, After 10 years	37,650
Securities available for sale debt securities, amortized cost	64,524	$ 63,514
Available-for-sale Securities, Fair value, 1 year or less	1,188
Available-for-sale Securities, Fair value, After 1 year through 5 years	18,294
Available-for-sale Securities, Fair value, After 5 years through 10 years	7,484
Available-for-sale Securities, Fair value, After 10 years	38,085
Available-for-sale Securities, Fair value, Total	$ 65,051	63,389
Weighted-average yield, GAAP basis, available for sale securities	2.93%
Held to Maturity Securities, Amortized Cost, 1 year or less	$ 34
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	748
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	1,866
Held to Maturity Securities, Amortized Cost, After 10 years	16,170
Held to Maturity Securities, Amortized Cost, Total	18,818	19,312
Held-to-maturity Securities, Fair Value, 1 year or less	34
Held-to-maturity Securities, Fair Value, After 1 year through 5 years	768
Held-to-maturity Securities, Fair Value, After 5 years through 10 years	1,928
Held-to-maturity Securities, Fair Value, After 10 years	16,078
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	$ 18,808	$ 19,019
Weighted-average yield, GAAP basis, held to maturity securities	3.31%
US Treasury and Government [Member]
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 679
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	13,599
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	3,795
Available for Sale Securities, Amortized Cost, After 10 years	785
Securities available for sale debt securities, amortized cost	18,858
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	490
Held to Maturity Securities, Amortized Cost, After 10 years	273
Held to Maturity Securities, Amortized Cost, Total	763
Asset backed [Member]
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	31
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	2,529
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	1,616
Available for Sale Securities, Amortized Cost, After 10 years	1,332
Securities available for sale debt securities, amortized cost	5,508
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	7
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	100
Held to Maturity Securities, Amortized Cost, After 10 years	67
Held to Maturity Securities, Amortized Cost, Total	174
Other [Member]
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	476
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	1,522
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	475
Available for Sale Securities, Amortized Cost, After 10 years	873
Securities available for sale debt securities, amortized cost	3,346
Held to Maturity Securities, Amortized Cost, 1 year or less	23
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	621
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	749
Held to Maturity Securities, Amortized Cost, After 10 years	442
Held to Maturity Securities, Amortized Cost, Total	1,835
Mortgage-backed Securities Agency [Member] \| Residential Mortgage-backed Securities [Member]
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	52
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	867
Available for Sale Securities, Amortized Cost, After 10 years	28,628
Securities available for sale debt securities, amortized cost	29,549
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	78
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	523
Held to Maturity Securities, Amortized Cost, After 10 years	14,716
Held to Maturity Securities, Amortized Cost, Total	15,317
Mortgage-backed Securities Agency [Member] \| Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	590
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	309
Available for Sale Securities, Amortized Cost, After 10 years	1,699
Securities available for sale debt securities, amortized cost	2,598
Held to Maturity Securities, Amortized Cost, 1 year or less	11
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	42
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	4
Held to Maturity Securities, Amortized Cost, After 10 years	50
Held to Maturity Securities, Amortized Cost, Total	107
Mortgage-backed Securities Non-agency [Member] \| Residential Mortgage-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, After 10 years	1,834
Securities available for sale debt securities, amortized cost	1,834
Held to Maturity Securities, Amortized Cost, After 10 years	149
Held to Maturity Securities, Amortized Cost, Total	149
Mortgage-backed Securities Non-agency [Member] \| Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	332
Available for Sale Securities, Amortized Cost, After 10 years	2,499
Securities available for sale debt securities, amortized cost	2,831
Held to Maturity Securities, Amortized Cost, After 10 years	473
Held to Maturity Securities, Amortized Cost, Total	$ 473
One Year or Less [Member]
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.58%
Weighted-average yield, GAAP basis, held to maturity securities	4.87%
After One Year Through Five Years [Member]
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.29%
Weighted-average yield, GAAP basis, held to maturity securities	3.84%
After Five Years Through Ten Years [Member]
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.98%
Weighted-average yield, GAAP basis, held to maturity securities	3.45%
After Ten Years [Member]
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	3.25%
Weighted-average yield, GAAP basis, held to maturity securities	3.27%

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

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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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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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

+ References

+ Details

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Period Type:	instant

- 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.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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