Offsetting Assets and Liabilities Gross and net information for selecting financial instruments (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value, by Balance Sheet Grouping [Table Text Block]

	December 31, 2017					December 31, 2016
(Dollar amounts in millions)	Carrying value		Estimated fair value		Level	Carrying value		Estimated fair value		Level
Financial assets:
Held-to-maturity investment securities	$	770	$	762	2	$	868	$	850	2
Loans and leases (including loans held for sale), net of allowance	44,306		44,226		3	42,254		42,111		3
Financial liabilities:
Time deposits	3,115		3,099		2	2,757		2,744		2
Other short-term borrowings	3,600		3,600		2	500		500		2
Long-term debt (less fair value hedges)	383		402		2	535		552		2

	December 31, 2017
(In millions)								Gross amounts not offset in the balance sheet
Description	Gross amounts recognized		Gross amounts offset in the balance sheet			Net amounts presented in the balance sheet		Financial instruments			Cash collateral received/pledged			Net amount
Assets:
Federal funds sold and security resell agreements	$	809	$	(295	)	$	514	$	—		$	—		$	514
Derivatives (included in other assets)	38		—			38		(21		)	(1		)	16
Total assets	$	847	$	(295	)	$	552	$	(21	)	$	(1	)	$	530
Liabilities:
Federal funds and other short-term borrowings	$	5,271	$	(295	)	$	4,976	$	—		$	—		$	4,976
Derivatives (included in other liabilities)	40		—			40		(21		)	(6		)	13
Total liabilities	$	5,311	$	(295	)	$	5,016	$	(21	)	$	(6	)	$	4,989

	December 31, 2016
(In millions)							Gross amounts not offset in the balance sheet
Description	Gross amounts recognized		Gross amounts offset in the balance sheet		Net amounts presented in the balance sheet		Financial instruments			Cash collateral received/pledged			Net amount
Assets:
Federal funds sold and security resell agreements	$	568	$	—	$	568	$	—		$	—		$	568
Derivatives (included in other assets)	64		—		64		(17		)	—			47
Total assets	$	632	$	—	$	632	$	(17	)	$	—		$	615
Liabilities:
Federal funds and other short-term borrowings	$	827	$	—	$	827	$	—		$	—		$	827
Derivatives (included in other liabilities)	59		—		59		(17		)	(17		)	25
Total liabilities	$	886	$	—	$	886	$	(17	)	$	(17	)	$	852