Fair Value Election and Measurement Level 3 Significant Unobservable Input Assumptions (Details) - USD ($) $ in Millions		9 Months Ended		12 Months Ended
		Sep. 30, 2015		Dec. 31, 2014
level 3 fair value assumptions [Line Items]
Trading assets	[1]	$ 6,537		$ 6,202
Available-for-sale Securities	[2]	27,270		26,770
Loans Held-for-sale, Fair Value Disclosure		1,883		1,892
Loans Receivable, Fair Value Disclosure		262		272
Servicing Asset at Fair Value, Amount		1,262		1,206
Other Liabilities, Fair Value Disclosure		23	[3]	27	[4]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Trading assets		38		25
Available-for-sale Securities		567		946
Loans Receivable, Fair Value Disclosure		262		272
Servicing Asset at Fair Value, Amount		1,262		1,206
Other Liabilities, Fair Value Disclosure		23	[3]	27	[4]
Fair Value, Measurements, Recurring [Member] | Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Other Assets, Fair Value Disclosure		$ 32	[5]	$ 20	[6]
Fair Value, Measurements, Recurring [Member] | Other Liabilities [Member] | Income Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
fair value inputs, loan production volume		0.00%		0.00%
Fair Value, Measurements, Recurring [Member] | Other Liabilities [Member] | Income Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
fair value inputs, loan production volume		150.00%		150.00%
Fair Value, Measurements, Recurring [Member] | Other Liabilities [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
fair value inputs, loan production volume		150.00%		1.07%
Fair Value, Measurements, Recurring [Member] | Other Liabilities [Member] | Income Approach Valuation Technique [Member] | Loan Production Volume [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Other Liabilities, Fair Value Disclosure		$ 23	[7]	$ 27	[8]
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Cost Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Available-for-sale Securities		440		785
Fair Value, Measurements, Recurring [Member] | Collateralized Debt Obligations [Member] | Market Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, indicative pricing based on overcollateralization ratio				$ 0
Fair Value Inputs, Estimated Collateral Losses				0.00%
Fair Value, Measurements, Recurring [Member] | Collateralized Debt Obligations [Member] | Market Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, indicative pricing based on overcollateralization ratio				$ 0
Fair Value Inputs, Estimated Collateral Losses				0.00%
Fair Value, Measurements, Recurring [Member] | Collateralized Debt Obligations [Member] | Market Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, indicative pricing based on overcollateralization ratio				$ 0
Fair Value Inputs, Estimated Collateral Losses				0.00%
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Available-for-sale Securities		15		$ 21
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Market Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Indicative Pricing				0
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Market Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Indicative Pricing				0
Fair Value, Measurements, Recurring [Member] | Other Debt Obligations [Member] | Cost Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Available-for-sale Securities		5		5
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Available-for-sale Securities				12
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Cost Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Available-for-sale Securities		5
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member] | Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Available-for-sale Securities		102		123
Fair Value, Measurements, Recurring [Member] | Residential Mortgage, Loans Held For Sale [Member] | Income Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Loans Held-for-sale, Fair Value Disclosure		$ 2		$ 1
Fair Value, Measurements, Recurring [Member] | Residential Mortgage, Loans Held For Sale [Member] | Income Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Option Adjusted Spread		1.43%		1.45%
Fair Value Inputs, Prepayment Rate		3.00%		1.00%
Fair Value Inputs, Probability of Default		0.00%		0.00%
Fair Value, Measurements, Recurring [Member] | Residential Mortgage, Loans Held For Sale [Member] | Income Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Option Adjusted Spread		1.62%		2.25%
Fair Value Inputs, Prepayment Rate		17.00%		30.00%
Fair Value Inputs, Probability of Default		2.00%		3.00%
Fair Value, Measurements, Recurring [Member] | Residential Mortgage, Loans Held For Sale [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Option Adjusted Spread		1.56%		1.57%
Fair Value Inputs, Prepayment Rate		11.00%		15.00%
Fair Value Inputs, Probability of Default		0.50%		0.75%
Fair Value, Measurements, Recurring [Member] | Loans Held For Investment [Member] | Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Loans Receivable, Fair Value Disclosure		$ 2		$ 3
Fair Value, Measurements, Recurring [Member] | Loans Held For Investment [Member] | Income Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Loans Receivable, Fair Value Disclosure		$ 260		$ 269
Fair Value, Measurements, Recurring [Member] | Loans Held For Investment [Member] | Income Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Option Adjusted Spread		0.00%		0.00%
Fair Value Inputs, Prepayment Rate		5.00%		4.00%
Fair Value Inputs, Probability of Default		0.00%		0.00%
Fair Value, Measurements, Recurring [Member] | Loans Held For Investment [Member] | Income Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Option Adjusted Spread		4.52%		4.50%
Fair Value Inputs, Prepayment Rate		36.00%		30.00%
Fair Value Inputs, Probability of Default		5.00%		7.00%
Fair Value, Measurements, Recurring [Member] | Loans Held For Investment [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Option Adjusted Spread		2.69%		2.86%
Fair Value Inputs, Prepayment Rate		13.00%		13.75%
Fair Value Inputs, Probability of Default		1.68%		1.75%
Fair Value, Measurements, Recurring [Member] | Mortgage Servicing Rights [Member] | Income Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Servicing Asset at Fair Value, Amount		$ 1,262		$ 1,206
Fair Value, Measurements, Recurring [Member] | Mortgage Servicing Rights [Member] | Income Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Option Adjusted Spread		(5.00%)
Fair Value Inputs, Prepayment Rate		2.00%		2.00%
Fair Value Inputs, Discount Rate				(1.00%)
Fair Value, Measurements, Recurring [Member] | Mortgage Servicing Rights [Member] | Income Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Option Adjusted Spread		107.00%
Fair Value Inputs, Prepayment Rate		21.00%		47.00%
Fair Value Inputs, Discount Rate				122.00%
Fair Value, Measurements, Recurring [Member] | Mortgage Servicing Rights [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Option Adjusted Spread		8.00%
Fair Value Inputs, Prepayment Rate		11.00%		11.00%
Fair Value Inputs, Discount Rate				10.00%
Fair Value, Measurements, Recurring [Member] | Other Assets [Member] | Market Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Pull Through Rate		39.00%		40.00%
Fair Value Inputs, Msr Value		0.26%		0.39%
Fair Value, Measurements, Recurring [Member] | Other Assets [Member] | Market Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Pull Through Rate		100.00%		100.00%
Fair Value Inputs, Msr Value		2.01%		2.18%
Fair Value, Measurements, Recurring [Member] | Other Assets [Member] | Market Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]
level 3 fair value assumptions [Line Items]
Fair Value Inputs, Pull Through Rate		75.00%		75.00%
Fair Value Inputs, Msr Value		1.00%		1.07%

[1] Includes trading securities pledged as collateral where counterparties have the right to sell or repledge the collateral of $1,152 million and $1,316 million at September 30, 2015 and December 31, 2014, respectively

[2] Includes securities AFS pledged as collateral where counterparties have the right to sell or repledge the collateral of $0 million and $369 million at September 30, 2015 and December 31, 2014, respectively.

[3] Includes contingent consideration obligations related to acquisitions.

[4] Includes contingent consideration obligations related to acquisitions.

[5] Represents the net of IRLC assets and liabilities entered into by the Mortgage Banking segment and includes the derivative liability associated with the Company's sale of Visa shares.

[6] Represents the net of IRLC assets and liabilities entered into by the Mortgage Banking segment and includes the derivative liability associated with the Company's sale of Visa shares.

[7] Input assumptions relate to the Company's contingent consideration obligations related to acquisitions. See Note 12, "Guarantees," for additional information.

[8] Input assumptions relate to the Company's contingent consideration obligations related to acquisitions. See Note 12, "Guarantees," for additional information.