Investment Securities (Contractual Maturity of Debt Securities) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, Total	$ 43,181,000,000	$ 47,988,000,000
Available-for-sale Securities, Fair value, Total	44,235,000,000us-gaap_AvailableForSaleSecurities	48,607,000,000us-gaap_AvailableForSaleSecurities
Weighted-average yield, GAAP basis, available for sale securities	2.85%
Weighted-average yield, GAAP basis, held to maturity securities	3.63%
One Year or Less [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	3.49%
Weighted-average yield, GAAP basis, held to maturity securities	4.42%
After One Year Through Five Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.55%
Weighted-average yield, GAAP basis, held to maturity securities	3.44%
After Five Years Through Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.36%
Weighted-average yield, GAAP basis, held to maturity securities	3.29%
After Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.99%
Weighted-average yield, GAAP basis, held to maturity securities	3.72%
US Treasury and Government Agencies Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	2,000,000
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	1,312,000,000
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	3,437,000,000
Available for Sale Securities, Amortized Cost, After 10 years	486,000,000
Available for Sale Securities, Amortized Cost, Total	5,237,000,000
Held to Maturity Securities, Amortized Cost, After 10 years	248,000,000
Held to Maturity Securities, Amortized Cost, Total	248,000,000
Residential Mortgage-backed Securities [Member] \| Mortgage-backed Securities Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	120,000,000
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	456,000,000
Available for Sale Securities, Amortized Cost, After 10 years	17,070,000,000
Available for Sale Securities, Amortized Cost, Total	17,646,000,000
Held to Maturity Securities, Amortized Cost, After 10 years	5,736,000,000
Held to Maturity Securities, Amortized Cost, Total	5,736,000,000
Residential Mortgage-backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	6,000,000
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	1,000,000
Available for Sale Securities, Amortized Cost, After 10 years	4,716,000,000
Available for Sale Securities, Amortized Cost, Total	4,723,000,000
Held to Maturity Securities, Amortized Cost, After 10 years	270,000,000
Held to Maturity Securities, Amortized Cost, Total	270,000,000
Commercial Mortgage Backed Securities [Member] \| Mortgage-backed Securities Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	128,000,000
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	206,000,000
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	20,000,000
Available for Sale Securities, Amortized Cost, After 10 years	1,824,000,000
Available for Sale Securities, Amortized Cost, Total	2,178,000,000
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	996,000,000
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	145,000,000
Held to Maturity Securities, Amortized Cost, After 10 years	59,000,000
Held to Maturity Securities, Amortized Cost, Total	1,200,000,000
Commercial Mortgage Backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	50,000,000
Available for Sale Securities, Amortized Cost, After 10 years	4,035,000,000
Available for Sale Securities, Amortized Cost, Total	4,085,000,000
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	6,000,000
Held to Maturity Securities, Amortized Cost, After 10 years	1,004,000,000
Held to Maturity Securities, Amortized Cost, Total	1,010,000,000
Asset backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	4,000,000
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	1,014,000,000
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	1,977,000,000
Available for Sale Securities, Amortized Cost, After 10 years	2,146,000,000
Available for Sale Securities, Amortized Cost, Total	5,141,000,000
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	17,000,000
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	408,000,000
Held to Maturity Securities, Amortized Cost, After 10 years	334,000,000
Held to Maturity Securities, Amortized Cost, Total	759,000,000
State and Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	5,000,000
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	134,000,000
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	324,000,000
Available for Sale Securities, Amortized Cost, After 10 years	1,490,000,000
Available for Sale Securities, Amortized Cost, Total	1,953,000,000
Held to Maturity Securities, Amortized Cost, 1 year or less	20,000,000
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	26,000,000
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	809,000,000
Held to Maturity Securities, Amortized Cost, After 10 years	1,187,000,000
Held to Maturity Securities, Amortized Cost, Total	2,042,000,000
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	91,000,000
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	1,045,000,000
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	437,000,000
Available for Sale Securities, Amortized Cost, After 10 years	203,000,000
Available for Sale Securities, Amortized Cost, Total	1,776,000,000
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	323,000,000
Held to Maturity Securities, Amortized Cost, Total	323,000,000
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	230,000,000
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	3,887,000,000
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	6,652,000,000
Available for Sale Securities, Amortized Cost, After 10 years	31,970,000,000
Available for Sale Securities, Amortized Cost, Total	42,739,000,000
Available-for-sale Securities, Fair value, 1 year or less	231,000,000
Available-for-sale Securities, Fair value, After 1 year through 5 years	3,976,000,000
Available-for-sale Securities, Fair value, After 5 years through 10 years	6,760,000,000
Available-for-sale Securities, Fair value, After 10 years	32,827,000,000
Available-for-sale Securities, Fair value, Total	43,794,000,000
Held to Maturity Securities, Amortized Cost, 1 year or less	20,000,000
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	1,045,000,000
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	1,685,000,000
Held to Maturity Securities, Amortized Cost, After 10 years	8,838,000,000
Held to Maturity Securities, Amortized Cost, Total	11,588,000,000
Held-to-maturity Securities, Fair Value, 1 year or less	20,000,000
Held-to-maturity Securities, Fair Value, After 1 year through 5 years	1,085,000,000
Held-to-maturity Securities, Fair Value, After 5 years through 10 years	1,751,000,000
Held-to-maturity Securities, Fair Value, After 10 years	9,128,000,000
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	$ 11,984,000,000

Represents the weighted-average yield by maturity for debt securities 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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