Revenue from Contracts with Customers (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Total revenue from contracts with customers		$ 184	$ 189
Other sources of noninterest income		54	55
Total noninterest income		238	244
Business Bank
Total revenue from contracts with customers		92	92
Other sources of noninterest income		44	39
Total noninterest income		136	131
Retail Bank
Total revenue from contracts with customers		29	32
Other sources of noninterest income		2	1
Total noninterest income		31	33
Wealth Management
Total revenue from contracts with customers		63	65
Other sources of noninterest income		1	2
Total noninterest income		64	67
Finance & Other
Total revenue from contracts with customers		0	0
Other sources of noninterest income		7	13
Total noninterest income		7	13
Credit and Debit Card [Member]
Total revenue from contracts with customers		63	59
Credit and Debit Card [Member] | Business Bank
Total revenue from contracts with customers		53	49
Credit and Debit Card [Member] | Retail Bank
Total revenue from contracts with customers		9	9
Credit and Debit Card [Member] | Wealth Management
Total revenue from contracts with customers		1	1
Credit and Debit Card [Member] | Finance & Other
Total revenue from contracts with customers		0	0
Service charges on deposit accounts
Total revenue from contracts with customers		51	54
Service charges on deposit accounts | Business Bank
Total revenue from contracts with customers		33	35
Service charges on deposit accounts | Retail Bank
Total revenue from contracts with customers		17	18
Service charges on deposit accounts | Wealth Management
Total revenue from contracts with customers		1	1
Service charges on deposit accounts | Finance & Other
Total revenue from contracts with customers		0	0
Fiduciary income
Total revenue from contracts with customers		49	52
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		49	52
Fiduciary income | Finance & Other
Total revenue from contracts with customers		0	0
Commercial loan servicing fees
Total revenue from contracts with customers	[1]	4	4
Commercial loan servicing fees | Business Bank
Total revenue from contracts with customers	[1]	4	4
Commercial loan servicing fees | Retail Bank
Total revenue from contracts with customers	[1]	0	0
Commercial loan servicing fees | Wealth Management
Total revenue from contracts with customers	[1]	0	0
Commercial loan servicing fees | Finance & Other
Total revenue from contracts with customers	[1]	0	0
Brokerage Commissions Revenue [Member]
Total revenue from contracts with customers		7	7
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	7
Brokerage Commissions Revenue [Member] | Finance & Other
Total revenue from contracts with customers		0	0
Other noninterest income
Total revenue from contracts with customers	[2]	10	13
Other noninterest income | Business Bank
Total revenue from contracts with customers	[2]	2	4
Other noninterest income | Retail Bank
Total revenue from contracts with customers	[2]	3	5
Other noninterest income | Wealth Management
Total revenue from contracts with customers	[2]	5	4
Other noninterest income | Finance & Other
Total revenue from contracts with customers	[2]	$ 0	$ 0

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

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