Investment Securities (Summary) (Details) (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	$ 47,988,000,000	$ 43,181,000,000
Securities available for sale debt securities, unrealized gains	1,138,000,000	1,262,000,000
Securities available for sale debt securities, unrealized losses	(519,000,000)	(208,000,000)
Securities available for sale, fair value	48,607,000,000us-gaap_AvailableForSaleSecurities	44,235,000,000us-gaap_AvailableForSaleSecurities
Quantifying Misstatement In Current Year Financial Statements	6,200,000,000
US Treasury and Government Agencies Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	3,990,000,000	5,237,000,000
Securities available for sale debt securities, unrealized gains	135,000,000	186,000,000
Securities available for sale debt securities, unrealized losses	(7,000,000)	(1,000,000)
Securities available for sale, fair value	4,118,000,000	5,422,000,000
Held-to-maturity securities, amortized cost	239,000,000	248,000,000
Held-to-maturity securities, unrealized gains	8,000,000	44,000,000
Held-to-maturity securities, unrealized losses	(4,000,000)
Held-to-maturity securities, fair value	243,000,000	292,000,000
Residential Mortgage-backed Securities [Member] \| Mortgage-backed Securities Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	21,556,000,000	17,646,000,000
Securities available for sale debt securities, unrealized gains	367,000,000	438,000,000
Securities available for sale debt securities, unrealized losses	(209,000,000)	(41,000,000)
Securities available for sale, fair value	21,714,000,000	18,043,000,000
Held-to-maturity securities, amortized cost	5,814,000,000	5,736,000,000
Held-to-maturity securities, unrealized gains	71,000,000	166,000,000
Held-to-maturity securities, unrealized losses	(64,000,000)	(10,000,000)
Held-to-maturity securities, fair value	5,821,000,000	5,892,000,000
Residential Mortgage-backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	5,457,000,000	4,723,000,000
Securities available for sale debt securities, unrealized gains	308,000,000	318,000,000
Securities available for sale debt securities, unrealized losses	(160,000,000)	(99,000,000)
Securities available for sale, fair value	5,605,000,000	4,942,000,000
Held-to-maturity securities, amortized cost	293,000,000	270,000,000
Held-to-maturity securities, unrealized gains		13,000,000
Held-to-maturity securities, unrealized losses	(4,000,000)
Held-to-maturity securities, fair value	289,000,000	283,000,000
Commercial Mortgage Backed Securities [Member] \| Mortgage-backed Securities Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	1,745,000,000	2,178,000,000
Securities available for sale debt securities, unrealized gains	32,000,000	23,000,000
Securities available for sale debt securities, unrealized losses	(14,000,000)	(14,000,000)
Securities available for sale, fair value	1,763,000,000	2,187,000,000
Held-to-maturity securities, amortized cost	1,251,000,000	1,200,000,000
Held-to-maturity securities, unrealized gains	49,000,000	53,000,000
Held-to-maturity securities, fair value	1,300,000,000	1,253,000,000
Commercial Mortgage Backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	3,937,000,000	4,085,000,000
Securities available for sale debt securities, unrealized gains	123,000,000	88,000,000
Securities available for sale debt securities, unrealized losses	(18,000,000)	(11,000,000)
Securities available for sale, fair value	4,042,000,000	4,162,000,000
Held-to-maturity securities, amortized cost	1,687,000,000	1,010,000,000
Held-to-maturity securities, unrealized gains	20,000,000	19,000,000
Held-to-maturity securities, unrealized losses	(5,000,000)
Held-to-maturity securities, fair value	1,702,000,000	1,029,000,000
Asset Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	5,754,000,000	5,141,000,000
Securities available for sale debt securities, unrealized gains	66,000,000	78,000,000
Securities available for sale debt securities, unrealized losses	(48,000,000)	(32,000,000)
Securities available for sale, fair value	5,772,000,000	5,187,000,000
Held-to-maturity securities, amortized cost	1,009,000,000	759,000,000
Held-to-maturity securities, unrealized gains	2,000,000	2,000,000
Held-to-maturity securities, unrealized losses	(10,000,000)	(8,000,000)
Held-to-maturity securities, fair value	1,001,000,000	753,000,000
State and Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	2,609,000,000	1,953,000,000
Securities available for sale debt securities, unrealized gains	52,000,000	88,000,000
Securities available for sale debt securities, unrealized losses	(44,000,000)	(3,000,000)
Securities available for sale, fair value	2,617,000,000	2,038,000,000
Held-to-maturity securities, amortized cost	1,055,000,000	2,042,000,000
Held-to-maturity securities, unrealized gains	10,000,000	111,000,000
Held-to-maturity securities, unrealized losses	(4,000,000)
Held-to-maturity securities, fair value	1,061,000,000	2,153,000,000
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	2,506,000,000	1,776,000,000
Securities available for sale debt securities, unrealized gains	55,000,000	43,000,000
Securities available for sale debt securities, unrealized losses	(18,000,000)	(6,000,000)
Securities available for sale, fair value	2,543,000,000	1,813,000,000
Held-to-maturity securities, amortized cost	339,000,000	323,000,000
Held-to-maturity securities, unrealized gains	9,000,000	6,000,000
Held-to-maturity securities, fair value	348,000,000	329,000,000
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	47,554,000,000	42,739,000,000
Securities available for sale debt securities, unrealized gains	1,138,000,000	1,262,000,000
Securities available for sale debt securities, unrealized losses	(518,000,000)	(207,000,000)
Securities available for sale, fair value	48,174,000,000	43,794,000,000
Held-to-maturity securities, amortized cost	11,687,000,000	11,588,000,000
Held-to-maturity securities, unrealized gains	169,000,000	414,000,000
Held-to-maturity securities, unrealized losses	(91,000,000)	(18,000,000)
Held-to-maturity securities, fair value	11,765,000,000	11,984,000,000
AFS to HTM Transfer Net Unrealized Gains In AOCI	111,000,000	125,000,000
Corporate Stocks And Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	434,000,000	442,000,000
Securities available for sale debt securities, unrealized losses	(1,000,000)	(1,000,000)
Securities available for sale, fair value	433,000,000	441,000,000
Residential And Commercial Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Quantifying Misstatement In Current Year Financial Statements	$ 1,100,000,000

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as 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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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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