Borrowed Funds (Narrative) (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Borrowed Funds	$ 56,768,000,000us-gaap_DebtAndCapitalLeaseObligations	$ 46,105,000,000us-gaap_DebtAndCapitalLeaseObligations
Due in 2015	15,300,000,000
Due in 2016	8,400,000,000
Due in 2017	10,700,000,000
Due in 2018	6,400,000,000
Due in 2019	6,900,000,000
Due in 2020 and thereafter	9,100,000,000
FHLB Borrowings	20,005,000,000	12,912,000,000
Bank notes [Member]
Debt Instrument [Line Items]
Basis adjustments related to fair value accounting hedges	20,000,000
Senior debt [Member]
Debt Instrument [Line Items]
Basis adjustments related to fair value accounting hedges	193,000,000
Junior subordinated debt [Member]
Debt Instrument [Line Items]
Principal amount of debt redeemable prior to maturity	206,000,000
Carrrying value of debt redeemable prior to maturity	205,000,000
Net discount on debt redeemable prior to maturity	1,000,000
Subordinated debt [Member]
Debt Instrument [Line Items]
Basis adjustments related to fair value accounting hedges	317,000,000
FHLB Borrowings [Member]
Debt Instrument [Line Items]
FHLB Advances	$ 0
Stated rate, minimum	0.00%
Stated rate, maximum	7.33%
Maturity start date	2015
Maturity end date	2030

Represents the basis adjustment related to fair value accounting hedges

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- Definition

The latest date when the outstanding debt instruments are required to be repaid, in CCYY format.

+ References

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The earliest date when the outstanding debt instruments are required to be repaid, in CCYY format.

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- Definition

Represents the principal amount of debt that is redeemable prior to maturity

+ References

No definition available.

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Represents the net discount on debt redeemable prior to maturity or the difference between the principal amount and carrying value of debt redeemable prior to maturity

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No definition available.

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- Definition

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Maximum contractual interest rate for funds borrowed, under the debt agreement.

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Minimum contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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