Investment Securities (Contractual Maturity of Debt Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	$ 61,907	$ 57,212
Available-for-sale Securities, Fair value, Total	61,211	57,618
Held to Maturity Securities, Amortized Cost, Total	19,593	18,513
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	893
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	16,399
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	8,704
Available for Sale Securities, Amortized Cost, After 10 years	35,911
Securities available for sale, amortized cost	61,907	56,625
Available-for-sale Securities, Fair value, 1 year or less	892
Available-for-sale Securities, Fair value, After 1 year through 5 years	16,160
Available-for-sale Securities, Fair value, After 5 years through 10 years	8,666
Available-for-sale Securities, Fair value, After 10 years	35,493
Available-for-sale Securities, Fair value, Total	$ 61,211	57,033
Weighted-average yield, GAAP basis, available for sale securities	2.85%
Held to Maturity Securities, Amortized Cost, 1 year or less	$ 96
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	660
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	1,898
Held to Maturity Securities, Amortized Cost, After 10 years	16,939
Held to Maturity Securities, Amortized Cost, Total	19,593	18,513
Held-to-maturity Securities, Fair Value, 1 year or less	96
Held-to-maturity Securities, Fair Value, After 1 year through 5 years	668
Held-to-maturity Securities, Fair Value, After 5 years through 10 years	1,912
Held-to-maturity Securities, Fair Value, After 10 years	16,345
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	$ 19,021	$ 18,565
Weighted-average yield, GAAP basis, held to maturity securities	3.30%
US Treasury and Government [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 265
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	12,052
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	4,434
Available for Sale Securities, Amortized Cost, After 10 years	303
Securities available for sale, amortized cost	17,054
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	484
Held to Maturity Securities, Amortized Cost, After 10 years	270
Held to Maturity Securities, Amortized Cost, Total	754
Residential Mortgage-backed Securities [Member] \| Mortgage-backed Securities Agency [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [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	67
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	611
Available for Sale Securities, Amortized Cost, After 10 years	28,014
Securities available for sale, amortized cost	28,694
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	69
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	507
Held to Maturity Securities, Amortized Cost, After 10 years	15,386
Held to Maturity Securities, Amortized Cost, Total	15,962
Residential Mortgage-backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, After 10 years	2,034
Securities available for sale, amortized cost	2,034
Held to Maturity Securities, Amortized Cost, After 10 years	155
Held to Maturity Securities, Amortized Cost, Total	155
Commercial Mortgage Backed Securities [Member] \| Mortgage-backed Securities Agency [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [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	457
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	412
Available for Sale Securities, Amortized Cost, After 10 years	1,177
Securities available for sale, amortized cost	2,050
Held to Maturity Securities, Amortized Cost, 1 year or less	62
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	47
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	4
Held to Maturity Securities, Amortized Cost, After 10 years	51
Held to Maturity Securities, Amortized Cost, Total	164
Commercial Mortgage Backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	445
Available for Sale Securities, Amortized Cost, After 10 years	2,116
Securities available for sale, amortized cost	2,561
Held to Maturity Securities, Amortized Cost, After 10 years	502
Held to Maturity Securities, Amortized Cost, Total	502
Asset backed [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	18
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	2,129
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	2,110
Available for Sale Securities, Amortized Cost, After 10 years	1,288
Securities available for sale, amortized cost	5,545
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	12
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	100
Held to Maturity Securities, Amortized Cost, After 10 years	75
Held to Maturity Securities, Amortized Cost, Total	187
Other Debt Obligations [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	604
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	1,694
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	692
Available for Sale Securities, Amortized Cost, After 10 years	979
Securities available for sale, amortized cost	3,969
Held to Maturity Securities, Amortized Cost, 1 year or less	34
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	532
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	803
Held to Maturity Securities, Amortized Cost, After 10 years	500
Held to Maturity Securities, Amortized Cost, Total	$ 1,869
One Year or Less [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.63%
Weighted-average yield, GAAP basis, held to maturity securities	4.67%
After One Year Through Five Years [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.17%
Weighted-average yield, GAAP basis, held to maturity securities	3.82%
After Five Years Through Ten Years [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.93%
Weighted-average yield, GAAP basis, held to maturity securities	3.45%
After Ten Years [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	3.16%
Weighted-average yield, GAAP basis, held to maturity securities	3.26%

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