Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Millions		3 Months Ended				9 Months Ended			12 Months Ended
		Sep. 30, 2015		Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2015		Sep. 30, 2014	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets	[1]	$ 6,537				$ 6,537			$ 6,202
Derivative Assets	[2]	1,449				1,449			1,307
Available-for-sale Securities	[3]	27,270				27,270			26,770
Loans Held-for-sale, Fair Value Disclosure		1,883				1,883			1,892
Loans Receivable, Fair Value Disclosure		262				262			272
Servicing Asset at Fair Value, Amount		1,262				1,262			1,206
Trading Liabilities, Fair Value Disclosure		1,330				1,330			1,227
Derivative Liabilities	[4]	565				565			462
Long-term Debt, Fair Value		986				986			1,283
Other Liabilities, Fair Value Disclosure		23	[5]			23	[5]		27	[6]
Netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		(3,809)	[7]			(3,809)	[7]		(4,532)	[8]
Trading Liabilities, Fair Value Disclosure		(4,365)	[7]			(4,365)	[7]		(5,115)	[8]
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		27,270				27,270			26,770
Loans Receivable, Fair Value Disclosure		262				262			272
Servicing Asset at Fair Value, Amount		1,262				1,262			1,206
Long-term Debt, Fair Value		986				986			1,283
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		982				982			1,000
Available-for-sale Securities		3,176				3,176			2,059
Loans Receivable, Fair Value Disclosure		0				0			0
Servicing Asset at Fair Value, Amount		0				0			0
Trading Liabilities, Fair Value Disclosure		939				939			929
Long-term Debt, Fair Value		0				0			0
Other Liabilities, Fair Value Disclosure		0				0			0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		9,326				9,326			9,709
Available-for-sale Securities		23,527				23,527			23,765
Loans Receivable, Fair Value Disclosure		0				0			0
Servicing Asset at Fair Value, Amount		0				0			0
Trading Liabilities, Fair Value Disclosure		4,750				4,750			5,408
Long-term Debt, Fair Value		986				986			1,283
Other Liabilities, Fair Value Disclosure		0				0			0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		38				38			25
Available-for-sale Securities		567				567			946
Loans Receivable, Fair Value Disclosure		262				262			272
Servicing Asset at Fair Value, Amount		1,262				1,262			1,206
Trading Liabilities, Fair Value Disclosure		6				6			5
Long-term Debt, Fair Value		0				0			0
Other Liabilities, Fair Value Disclosure		23	[5]			23	[5]		27	[6]
Other Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers to other balance sheet line items		0		$ 0		0		$ (3)
Collateralized Loan Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		2				2			3
Collateralized Loan Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		0				0			0
Collateralized Loan Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		2				2			3
Collateralized Loan Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		0				0			0
Investment in Federal Home Loan Bank Stock [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure		32				32			376
Interest Rate Lock Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		41		$ 64		138		181
Trading Loans [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		2,739				2,739			2,610
Trading Loans [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		0				0			0
Trading Loans [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		2,739				2,739			2,610
Trading Loans [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		0				0			0
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		65				65			45
Available-for-sale Securities		551	[9]			551	[9]		923	[10]
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		65				65			45
Available-for-sale Securities		111	[9]			111	[9]		138	[10]
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		0				0			0
Available-for-sale Securities		0				0			0
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		0				0			0
Available-for-sale Securities		440	[9]			440	[9]		785	[10]
Derivative Financial Instruments, Assets | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		474				474			688
Derivative Financial Instruments, Assets | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		4,746				4,746			5,126
Derivative Financial Instruments, Assets | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		38				38			25
Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		312				312			327
Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		0				0			0
Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		312				312			327
Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		0				0			0
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		390				390			509
Available-for-sale Securities		38				38			41
Trading Liabilities, Fair Value Disclosure		177				177			279
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		0				0			0
Available-for-sale Securities		0				0			0
Trading Liabilities, Fair Value Disclosure		0				0			0
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		390				390			509
Available-for-sale Securities		33				33			36
Trading Liabilities, Fair Value Disclosure		177				177			279
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		0				0			0
Available-for-sale Securities		5				5			5
Trading Liabilities, Fair Value Disclosure		0				0			0
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		15				15			21
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0				0			0
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0				0			0
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		15				15			21
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		102				102			123
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0				0			0
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		0				0			0
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		102				102			123
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		565				565			545
Available-for-sale Securities		22,905				22,905			23,048
Trading Liabilities, Fair Value Disclosure		4				4			1
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		0				0			0
Available-for-sale Securities		0				0			0
Trading Liabilities, Fair Value Disclosure		0				0			0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		565				565			545
Available-for-sale Securities		22,905				22,905			23,048
Trading Liabilities, Fair Value Disclosure		4				4			1
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		0				0			0
Available-for-sale Securities		0				0			0
Trading Liabilities, Fair Value Disclosure		0				0			0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		40				40			42
Available-for-sale Securities		174				174			209
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		0				0			0
Available-for-sale Securities		0				0			0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		40				40			42
Available-for-sale Securities		169				169			197
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		0				0			0
Available-for-sale Securities		5				5			12
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		532				532			547
Available-for-sale Securities		420				420			484
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		0				0			0
Available-for-sale Securities		0				0			0
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		532				532			547
Available-for-sale Securities		420				420			484
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		0				0			0
Available-for-sale Securities		0				0			0
US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		443				443			267
Available-for-sale Securities		3,065				3,065			1,921
Trading Liabilities, Fair Value Disclosure		584				584			485
US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		443				443			267
Available-for-sale Securities		3,065				3,065			1,921
Trading Liabilities, Fair Value Disclosure		584				584			485
US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		0				0			0
Available-for-sale Securities		0				0			0
Trading Liabilities, Fair Value Disclosure		0				0			0
US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		0				0			0
Available-for-sale Securities		0				0			0
Trading Liabilities, Fair Value Disclosure		0				0			0
Derivative Financial Instruments, Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Liabilities, Fair Value Disclosure		355				355			444
Derivative Financial Instruments, Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Liabilities, Fair Value Disclosure		4,569				4,569			5,128
Derivative Financial Instruments, Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Liabilities, Fair Value Disclosure		6				6			5
Federal Reserve Bank Stock [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure		402				402			402
Equity Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure		111				111			138
Residential Mortgage, Loans Held For Sale [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure		1,883				1,883			1,892
Residential Mortgage, Loans Held For Sale [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure		0				0			0
Residential Mortgage, Loans Held For Sale [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure		1,881				1,881			1,891
Residential Mortgage, Loans Held For Sale [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure		2				2			1
Trading Account Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3								0
Transfers to other balance sheet line items								$ (185)
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure		4,916				4,916			8,229
Trading assets		6,537				6,537			6,202
Available-for-sale Securities		27,270				27,270			26,770
Loans Held-for-sale, Fair Value Disclosure		2,034				2,034			3,240
Trading Liabilities, Fair Value Disclosure		1,330				1,330			1,227
Long-term Debt, Fair Value		8,403				8,403			13,056
Loans Net Fair Value Disclosure		129,046				129,046			126,855
Consumer And Commercial Deposits, Fair Value Disclosure		146,407				146,407			140,562
Short-term Debt, Fair Value		3,942				3,942			9,186
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure		4,916				4,916			8,229
Trading assets		982				982			1,000
Available-for-sale Securities		3,176				3,176			2,059
Loans Held-for-sale, Fair Value Disclosure		0				0			0
Trading Liabilities, Fair Value Disclosure		939				939			929
Long-term Debt, Fair Value		0				0			0
Loans Net Fair Value Disclosure		0				0			0
Consumer And Commercial Deposits, Fair Value Disclosure		0				0			0
Short-term Debt, Fair Value		0				0			0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure		0				0			0
Trading assets		5,517				5,517			5,177
Available-for-sale Securities		23,527				23,527			23,765
Loans Held-for-sale, Fair Value Disclosure		2,007				2,007			2,063
Trading Liabilities, Fair Value Disclosure		385				385			293
Long-term Debt, Fair Value		7,852				7,852			12,398
Loans Net Fair Value Disclosure		406				406			545
Consumer And Commercial Deposits, Fair Value Disclosure		146,407				146,407			140,562
Short-term Debt, Fair Value		3,942				3,942			9,186
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure		0				0			0
Trading assets		38				38			25
Available-for-sale Securities		567				567			946
Loans Held-for-sale, Fair Value Disclosure		27				27			1,177
Trading Liabilities, Fair Value Disclosure		6				6			5
Long-term Debt, Fair Value		551				551			658
Loans Net Fair Value Disclosure		128,640				128,640			126,310
Consumer And Commercial Deposits, Fair Value Disclosure		0				0			0
Short-term Debt, Fair Value		0				0			0
Reported Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure		4,916				4,916			8,229
Trading assets		6,537				6,537			6,202
Available-for-sale Securities		27,270				27,270			26,770
Loans Held-for-sale, Fair Value Disclosure		2,032				2,032			3,232
Trading Liabilities, Fair Value Disclosure		1,330				1,330			1,227
Long-term Debt, Fair Value		8,444				8,444			13,022
Loans Net Fair Value Disclosure		131,774				131,774			131,175
Consumer And Commercial Deposits, Fair Value Disclosure		146,371				146,371			140,567
Short-term Debt, Fair Value		3,942				3,942			9,186
Affordable Housing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges									15
Affordable Housing [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges					$ 36	0			21
Other Assets [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges		1				7			64
Other Assets [Member] | Property Subject to Operating Lease [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges									59
Other Assets [Member] | Land [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges		1				1			5
Other Trading [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets		1,449				1,449			1,307
Derivative Liabilities		565				565			462
Trading Account Assets [Member] | Commercial and Corporate Leveraged Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure		261				261			284
Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading assets		65				65			45
Available-for-sale Securities	[11]	551				551			923
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure		$ 6				$ 6			$ 7

[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] At September 30, 2015, $1.4 billion, net of $541 million offsetting cash collateral, is recognized in trading assets and derivative instruments within the Company's Consolidated Balance Sheets. At December 31, 2014, $1.3 billion, net of $449 million offsetting cash collateral, is recognized in trading assets and derivative instruments within the Company's Consolidated Balance Sheets.

[3] 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.

[4] At September 30, 2015, $565 million, net of $1.1 billion offsetting cash collateral, is recognized in trading liabilities and derivative instruments within the Company's Consolidated Balance Sheets. At December 31, 2014, $462 million, net of $1.0 billion offsetting cash collateral, is recognized in trading liabilities and derivative instruments within the Company's Consolidated Balance Sheets.

[5] Includes contingent consideration obligations related to acquisitions.

[6] Includes contingent consideration obligations related to acquisitions.

[7] Amounts represent offsetting cash collateral received from, and paid to, the same derivative counterparties, and the impact of netting derivative assets and derivative liabilities when a legally enforceable master netting agreement or similar agreement exists.

[8] Amounts represent offsetting cash collateral received from, and paid to, the same derivative counterparties, and the impact of netting derivative assets and derivative liabilities when a legally enforceable master netting agreement or similar agreement exists.

[9] Includes $111 million of mutual fund investments, $32 million of FHLB of Atlanta stock, $402 million of Federal Reserve Bank of Atlanta stock, and $6 million of other.

[10] Includes $138 million of mutual fund investments, $376 million of FHLB of Atlanta stock, $402 million of Federal Reserve Bank of Atlanta stock, and $7 million of other.

[11] At September 30, 2015, the fair value of other equity securities was comprised of the following: $32 million of FHLB of Atlanta stock, $402 million of Federal Reserve Bank of Atlanta stock, $111 million of mutual fund investments, and $6 million of other. At December 31, 2014, the fair value of other equity securities was comprised of the following: $376 million of FHLB of Atlanta stock, $402 million of Federal Reserve Bank of Atlanta stock, $138 million of mutual fund investments, and $7 million of other.