Investment Securities (Contractual Maturity of Debt Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 1,281
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	17,679
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	7,293
Available for Sale Securities, Amortized Cost, After 10 years	37,261
Securities available for sale debt securities, amortized cost	63,514	$ 56,625
Available-for-sale Securities, Fair value, 1 year or less	1,277
Available-for-sale Securities, Fair value, After 1 year through 5 years	17,567
Available-for-sale Securities, Fair value, After 5 years through 10 years	7,343
Available-for-sale Securities, Fair Value, After 10 years	37,202
Available-for-sale Securities, Fair Value	$ 63,389	57,033
Weighted-average yield, GAAP basis, available for sale securities	2.90%
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	$ 70
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	701
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	1,910
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	16,631
Debt Securities, Held-to-maturity	19,312	18,513
Held-to-maturity Securities, Fair Value, 1 year or less	70
Held-to-maturity Securities, Fair Value, After 1 year through 5 years	713
Held-to-maturity, Securities, Fair Value, After 5 through 10 years	1,948
Held-to-maturity, Securities, Fair Value, After 10 years	16,288
Debt Securities, Held-to-maturity, Fair Value	$ 19,019	$ 18,565
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	2.33%
Weighted-average yield, GAAP basis, held to maturity securities	4.79%
After One Year Through Five Years
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.27%
Weighted-average yield, GAAP basis, held to maturity securities	3.81%
After Five Years Through Ten Years
Debt Securities, Available-for-sale [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	3.03%
Weighted-average yield, GAAP basis, held to maturity securities	3.55%
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	3.31%
US Treasury and Government Agencies Securities
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 678
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	13,285
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	3,546
Available for Sale Securities, Amortized Cost, After 10 years	595
Securities available for sale debt securities, amortized cost	18,104
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	487
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	271
Debt Securities, Held-to-maturity	758
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	1
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	64
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	629
Available for Sale Securities, Amortized Cost, After 10 years	28,719
Securities available for sale debt securities, amortized cost	29,413
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	74
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	529
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	15,137
Debt Securities, Held-to-maturity	15,740
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	1,924
Securities available for sale debt securities, amortized cost	1,924
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	152
Debt Securities, Held-to-maturity	152
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	4
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	596
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	306
Available for Sale Securities, Amortized Cost, After 10 years	1,724
Securities available for sale debt securities, amortized cost	2,630
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	46
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	42
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	4
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	51
Debt Securities, Held-to-maturity	143
Commercial Mortgage Backed Securities \| Mortgage-backed Securities Non-agency
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	425
Available for Sale Securities, Amortized Cost, After 10 years	2,264
Securities available for sale debt securities, amortized cost	2,689
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	488
Debt Securities, Held-to-maturity	488
Asset backed
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	26
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	2,118
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	1,674
Available for Sale Securities, Amortized Cost, After 10 years	1,115
Securities available for sale debt securities, amortized cost	4,933
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	12
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	100
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	70
Debt Securities, Held-to-maturity	182
Other debt
Debt Securities, Available-for-sale [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	572
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	1,616
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	713
Available for Sale Securities, Amortized Cost, After 10 years	920
Securities available for sale debt securities, amortized cost	3,821
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	24
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	573
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	790
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	462
Debt Securities, Held-to-maturity	$ 1,849

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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