AOCI (Tables)

3 Months Ended

Mar. 31, 2020

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Changes in AOCI

AOCI includes the after-tax change in unrecognized net costs related to defined benefit pension and OPEB plans as well as unrealized gains and losses on cash flow hedges and AFS securities.

Three Months Ended March 31, 2020 and 2019 (Dollars in millions)	Pension and OPEB Costs		Cash Flow Hedges		AFS Securities		Other, net		Total
AOCI balance, January 1, 2019	$	(1,164)	$	(31)	$	(500)	$	(20)	$	(1,715)
OCI before reclassifications, net of tax	—		(30)		314		2		286
Amounts reclassified from AOCI:
Before tax	23		(5)		(6)		—		12
Tax effect	6		(1)		(1)		—		4
Amounts reclassified, net of tax	17		(4)		(5)		—		8
Total OCI, net of tax	17		(34)		309		2		294
AOCI balance, March 31, 2019	$	(1,147)	$	(65)	$	(191)	$	(18)	$	(1,421)
AOCI balance, January 1, 2020	$	(1,122)	$	(101)	$	380	$	(1)	$	(844)
OCI before reclassifications, net of tax	—		—		1,690		(5)		1,685
Amounts reclassified from AOCI:
Before tax	20		15		41		—		76
Tax effect	5		4		10		—		19
Amounts reclassified, net of tax	15		11		31		—		57
Total OCI, net of tax	15		11		1,721		(5)		1,742
AOCI balance, March 31, 2020	$	(1,107)	$	(90)	$	2,101	$	(6)	$	898
Primary income statement location of amounts reclassified from AOCI	Other expense		Net interest income		Net interest income		Net interest income