Investment Securities (Contractual Maturity of Debt Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	$ 56,595	$ 59,906
Available-for-sale Securities, Fair value, Total	57,254	60,104
Held to Maturity Securities, Amortized Cost, Total	17,740	15,843
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	747
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	11,282
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	8,675
Available for Sale Securities, Amortized Cost, After 10 years	35,355
Securities available for sale, amortized cost	56,059	59,303
Available-for-sale Securities, Fair value, 1 year or less	752
Available-for-sale Securities, Fair value, After 1 year through 5 years	11,348
Available-for-sale Securities, Fair value, After 5 years through 10 years	8,760
Available-for-sale Securities, Fair value, After 10 years	35,860
Available-for-sale Securities, Fair value, Total	$ 56,720	59,503
Weighted-average yield, GAAP basis, available for sale securities	2.67%
Held to Maturity Securities, Amortized Cost, 1 year or less	$ 170
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	577
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	1,937
Held to Maturity Securities, Amortized Cost, After 10 years	15,056
Held to Maturity Securities, Amortized Cost, Total	17,740	15,843
Held-to-maturity Securities, Fair Value, 1 year or less	170
Held-to-maturity Securities, Fair Value, After 1 year through 5 years	597
Held-to-maturity Securities, Fair Value, After 5 years through 10 years	2,015
Held-to-maturity Securities, Fair Value, After 10 years	15,113
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	$ 17,895	15,866
Weighted-average yield, GAAP basis, held to maturity securities	3.23%
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	2.95%
Weighted-average yield, GAAP basis, held to maturity securities	3.29%
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	2.16%
Weighted-average yield, GAAP basis, held to maturity securities	3.95%
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	2.24%
Weighted-average yield, GAAP basis, held to maturity securities	3.38%
After Ten Years [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.94%
Weighted-average yield, GAAP basis, held to maturity securities	3.19%
Asset-backed Securities [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 43
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	1,853
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	1,853
Available for Sale Securities, Amortized Cost, After 10 years	1,534
Securities available for sale, amortized cost	5,283	5,938
Available-for-sale Securities, Fair value, Total	5,352	5,968
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	264
Held to Maturity Securities, Amortized Cost, After 10 years	91
Held to Maturity Securities, Amortized Cost, Total	355	558
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	356	556
US Treasury and Government Agencies Securities [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	158
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	6,992
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	4,766
Available for Sale Securities, Amortized Cost, After 10 years	1,317
Securities available for sale, amortized cost	13,233	13,100
Available-for-sale Securities, Fair value, Total	13,384	13,174
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	376
Held to Maturity Securities, Amortized Cost, After 10 years	360
Held to Maturity Securities, Amortized Cost, Total	736	527
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	765	540
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	56
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	571
Available for Sale Securities, Amortized Cost, After 10 years	25,115
Securities available for sale, amortized cost	25,744	26,245
Available-for-sale Securities, Fair value, Total	25,750	26,128
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	50
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	377
Held to Maturity Securities, Amortized Cost, After 10 years	13,082
Held to Maturity Securities, Amortized Cost, Total	13,509	11,074
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	13,513	10,981
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, 1 year or less	1
Available for Sale Securities, Amortized Cost, After 10 years	2,641
Securities available for sale, amortized cost	2,642	3,191
Available-for-sale Securities, Fair value, Total	2,946	3,366
Held to Maturity Securities, Amortized Cost, After 10 years	174
Held to Maturity Securities, Amortized Cost, Total	174	191
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	180	198
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	3
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	206
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	683
Available for Sale Securities, Amortized Cost, After 10 years	1,110
Securities available for sale, amortized cost	2,002	2,150
Available-for-sale Securities, Fair value, Total	1,977	2,119
Held to Maturity Securities, Amortized Cost, 1 year or less	157
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	214
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	5
Held to Maturity Securities, Amortized Cost, After 10 years	54
Held to Maturity Securities, Amortized Cost, Total	430	903
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	438	927
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, 1 year or less
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	99
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	189
Available for Sale Securities, Amortized Cost, After 10 years	2,442
Securities available for sale, amortized cost	2,730	4,023
Available-for-sale Securities, Fair value, Total	2,751	4,025
Held to Maturity Securities, Amortized Cost, After 10 years	543
Held to Maturity Securities, Amortized Cost, Total	543	567
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	559	577
Other debt [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	540
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	2,076
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	613
Available for Sale Securities, Amortized Cost, After 10 years	1,196
Securities available for sale, amortized cost	4,425	4,656
Available-for-sale Securities, Fair value, Total	4,560	4,723
Held to Maturity Securities, Amortized Cost, 1 year or less	13
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	313
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	915
Held to Maturity Securities, Amortized Cost, After 10 years	752
Held to Maturity Securities, Amortized Cost, Total	1,993	2,023
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	$ 2,084	$ 2,087

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