Investment Securities (Contractual Maturity of Debt Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	$ 56,455	$ 55,269
Available-for-sale Securities, Fair value, Total	57,415	55,760
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	1,250
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	8,414
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	7,395
Available for Sale Securities, Amortized Cost, After 10 years	38,983
Securities available for sale, amortized cost	56,042	54,679
Available-for-sale Securities, Fair value, 1 year or less	1,256
Available-for-sale Securities, Fair value, After 1 year through 5 years	8,529
Available-for-sale Securities, Fair value, After 5 years through 10 years	7,510
Available-for-sale Securities, Fair value, After 10 years	39,707
Available-for-sale Securities, Fair value, Total	$ 57,002	55,171
Weighted-average yield, GAAP basis, available for sale securities	2.71%
Held to Maturity Securities, Amortized Cost, 1 year or less	$ 118
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	995
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	2,035
Held to Maturity Securities, Amortized Cost, After 10 years	12,006
Held to Maturity Securities, Amortized Cost, Total	15,154	14,768
Held-to-maturity Securities, Fair Value, 1 year or less	118
Held-to-maturity Securities, Fair Value, After 1 year through 5 years	1,030
Held-to-maturity Securities, Fair Value, After 5 years through 10 years	2,128
Held-to-maturity Securities, Fair Value, After 10 years	12,332
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	$ 15,608	$ 15,002
Weighted-average yield, GAAP basis, held to maturity securities	3.42%
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	2.79%
Weighted-average yield, GAAP basis, held to maturity securities	3.02%
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	2.19%
Weighted-average yield, GAAP basis, held to maturity securities	3.48%
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	2.32%
Weighted-average yield, GAAP basis, held to maturity securities	3.26%
After Ten Years [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.90%
Weighted-average yield, GAAP basis, held to maturity securities	3.44%
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	$ 953
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	4,466
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	3,756
Available for Sale Securities, Amortized Cost, After 10 years	1,062
Securities available for sale, amortized cost	10,237
Held to Maturity Securities, Amortized Cost, After 10 years	260
Held to Maturity Securities, Amortized Cost, Total	260
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, After 1 year through 5 years	128
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	919
Available for Sale Securities, Amortized Cost, After 10 years	24,194
Securities available for sale, amortized cost	25,241
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	376
Held to Maturity Securities, Amortized Cost, After 10 years	9,726
Held to Maturity Securities, Amortized Cost, Total	10,109
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 1 year through 5 years	3
Available for Sale Securities, Amortized Cost, After 10 years	3,833
Securities available for sale, amortized cost	3,836
Held to Maturity Securities, Amortized Cost, After 10 years	227
Held to Maturity Securities, Amortized Cost, Total	227
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	21
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	124
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	252
Available for Sale Securities, Amortized Cost, After 10 years	1,454
Securities available for sale, amortized cost	1,851
Held to Maturity Securities, Amortized Cost, 1 year or less	118
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	824
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	122
Held to Maturity Securities, Amortized Cost, After 10 years	57
Held to Maturity Securities, Amortized Cost, Total	1,121
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	50
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	28
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	8
Available for Sale Securities, Amortized Cost, After 10 years	4,641
Securities available for sale, amortized cost	4,727
Held to Maturity Securities, Amortized Cost, After 10 years	683
Held to Maturity Securities, Amortized Cost, Total	683
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	1,622
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	1,814
Available for Sale Securities, Amortized Cost, After 10 years	2,180
Securities available for sale, amortized cost	5,634
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	2
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	589
Held to Maturity Securities, Amortized Cost, After 10 years	120
Held to Maturity Securities, Amortized Cost, Total	711
State and Municipal [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	127
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	348
Available for Sale Securities, Amortized Cost, After 10 years	1,477
Securities available for sale, amortized cost	1,954
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	62
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	948
Held to Maturity Securities, Amortized Cost, After 10 years	933
Held to Maturity Securities, Amortized Cost, Total	1,943
Other Debt Securities [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	206
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	1,916
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	298
Available for Sale Securities, Amortized Cost, After 10 years	142
Securities available for sale, amortized cost	2,562
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	100
Held to Maturity Securities, Amortized Cost, Total	$ 100

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