AOCI (Tables)

3 Months Ended

Mar. 31, 2021

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, 2021 and 2020 (Dollars in millions)	Pension and OPEB Costs		Cash Flow Hedges		AFS Securities		Other, net		Total
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
AOCI balance, January 1, 2021	$	(875)	$	(64)	$	1,654	$	1	$	716
OCI before reclassifications, net of tax	28		—		(2,408)		1		(2,379)
Amounts reclassified from AOCI:
Before tax	9		47		136		—		192
Tax effect	2		11		32		—		45
Amounts reclassified, net of tax	7		36		104		—		147
Total OCI, net of tax	35		36		(2,304)		1		(2,232)
AOCI balance, March 31, 2021	$	(840)	$	(28)	$	(650)	$	2	$	(1,516)
Primary income statement location of amounts reclassified from AOCI	Other expense		Net interest income and Other expense		Securities gains (losses) and Net interest income		Net interest income