Revenue from Contracts with Customers (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2018		Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017
Total revenue from contracts with customers		$ 190			$ 563
Card Fees		61	[1]	$ 85	180	[2]	$ 242
Service charges on deposit accounts		53	[1]	57	160	[2]	172
Fiduciary income		51		48	155		148
Commercial lending fees		21		21	62		63
Letter of credit fees		9		11	30		34
Bank-owned life insurance		11		12	29		31
Foreign exchange income		12		11	36		33
Brokerage fees		7		6	20		17
Other sources of noninterest income		44		24	163		82
Total noninterest income		234		275	726		822
Adoption of Topic 606 change in presentation
Decrease in card fees due to change in presentation		34			105
Decrease in service charges on deposit accounts due to change in presentation		2			4
Business Bank
Total revenue from contracts with customers		92			274
Card Fees				73			206
Service charges on deposit accounts				36			108
Fiduciary income				0			0
Commercial lending fees				21			63
Letter of credit fees				10			33
Bank-owned life insurance				0			0
Foreign exchange income				11			32
Brokerage fees				0			0
Other sources of noninterest income		45		7	129		31
Total noninterest income		137		158	403		473
Retail Bank
Total revenue from contracts with customers		34			95
Card Fees				11			32
Service charges on deposit accounts				20			60
Fiduciary income				0			0
Commercial lending fees				0			0
Letter of credit fees				0			0
Bank-owned life insurance				0			0
Foreign exchange income				0			0
Brokerage fees				0			0
Other sources of noninterest income		1		8	5		24
Total noninterest income		35		39	100		116
Wealth Management
Total revenue from contracts with customers		64			194
Card Fees				1			4
Service charges on deposit accounts				1			4
Fiduciary income				48			148
Commercial lending fees				0			0
Letter of credit fees				1			1
Bank-owned life insurance				0			0
Foreign exchange income				0			1
Brokerage fees				6			17
Other sources of noninterest income		2		5	7		16
Total noninterest income		66		62	201		191
Finance & Other
Total revenue from contracts with customers		0			0
Card Fees				0			0
Service charges on deposit accounts				0			0
Fiduciary income				0			0
Commercial lending fees				0			0
Letter of credit fees				0			0
Bank-owned life insurance				12			31
Foreign exchange income				0			0
Brokerage fees				0			0
Other sources of noninterest income		(4)		4	22		11
Total noninterest income		(4)		$ 16	22		$ 42
Credit and Debit Card [Member]
Total revenue from contracts with customers		61	[1]		180	[2]
Credit and Debit Card [Member] | Business Bank
Total revenue from contracts with customers		50	[1]		149	[2]
Credit and Debit Card [Member] | Retail Bank
Total revenue from contracts with customers		10	[1]		28	[2]
Credit and Debit Card [Member] | Wealth Management
Total revenue from contracts with customers		1	[1]		3	[2]
Credit and Debit Card [Member] | Finance & Other
Total revenue from contracts with customers		0	[1]		0	[2]
Service charges on deposit accounts
Total revenue from contracts with customers		53	[1]		160	[2]
Service charges on deposit accounts | Business Bank
Total revenue from contracts with customers		34	[1]		102	[2]
Service charges on deposit accounts | Retail Bank
Total revenue from contracts with customers		18	[1]		54	[2]
Service charges on deposit accounts | Wealth Management
Total revenue from contracts with customers		1	[1]		4	[2]
Service charges on deposit accounts | Finance & Other
Total revenue from contracts with customers		0	[1]		0	[2]
Fiduciary income
Total revenue from contracts with customers		51			155
Fiduciary income | Business Bank
Total revenue from contracts with customers		0			0
Fiduciary income | Retail Bank
Total revenue from contracts with customers		0			0
Fiduciary income | Wealth Management
Total revenue from contracts with customers		51			155
Fiduciary income | Finance & Other
Total revenue from contracts with customers		0			0
Commercial loan servicing fees
Total revenue from contracts with customers	[3]	5			14
Commercial loan servicing fees | Business Bank
Total revenue from contracts with customers	[3]	5			14
Commercial loan servicing fees | Retail Bank
Total revenue from contracts with customers	[3]	0			0
Commercial loan servicing fees | Wealth Management
Total revenue from contracts with customers	[3]	0			0
Commercial loan servicing fees | Finance & Other
Total revenue from contracts with customers	[3]	0			0
Brokerage Commissions Revenue [Member]
Total revenue from contracts with customers		7			20
Brokerage Commissions Revenue [Member] | Business Bank
Total revenue from contracts with customers		0			0
Brokerage Commissions Revenue [Member] | Retail Bank
Total revenue from contracts with customers		0			0
Brokerage Commissions Revenue [Member] | Wealth Management
Total revenue from contracts with customers		7			20
Brokerage Commissions Revenue [Member] | Finance & Other
Total revenue from contracts with customers		0			0
Other noninterest income
Total revenue from contracts with customers	[4]	13			34
Other noninterest income | Business Bank
Total revenue from contracts with customers	[4]	3			9
Other noninterest income | Retail Bank
Total revenue from contracts with customers	[4]	6			13
Other noninterest income | Wealth Management
Total revenue from contracts with customers	[4]	4			12
Other noninterest income | Finance & Other
Total revenue from contracts with customers	[4]	$ 0			$ 0

[1] Adoption of Topic 606 resulted in a change in presentation which records certain costs in the same category as the associated revenues.The effect of this change was to reduce card fees by $34 million and service charges on deposit accounts by $2 million for the three months ended September 30, 2018. Refer to note 1 for further information.

[2] Adoption of Topic 606 resulted in a change in presentation which records certain costs in the same category as the associated revenues. The effect of this change was to reduce card fees by $105 million and service charges on deposit accounts by $4 million for the nine months ended September 30, 2018. Refer to note 1 for further information.

[3] Included in commercial lending fees on the Consolidated Statements of Comprehensive Income.

[4] Excludes derivative, warrant and other miscellaneous income.