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Business Segments (Tables)
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Summary of Impacts of Changes to Internal Management Reporting
The following tables summarize the impact of these changes on reported segment profit (loss) before tax, total assets and total deposits for the periods below:
Year Ended
December 31, 2019		Year Ended
December 31, 2018
As Previously ReportedAfter Reporting ChangesAs Previously ReportedAfter Reporting Changes
(in millions)
Segment profit (loss) before tax:
RBWM$(465)NR$(138)NR
WPBNR$(412)NR$(47)
CMB410 432 477 502 
GBM472 571 721 834 
PB(9)NR13 NR
CC(52)(235)(344)(560)
NR Not Reported
At December 31, 2019At December 31, 2018
As Previously ReportedAfter Reporting ChangesAs Previously ReportedAfter Reporting Changes
(in millions)
Segment total assets:
RBWM(1)
$19,429 NR$19,000 NR
WPBNR$50,851 NR$53,298 
CMB25,737 34,241 25,047 34,214 
GBM88,440 126,710 73,187 112,911 
PB(1)
7,326 NR6,797 NR
CC73,291 2,421 79,344 2,952 
Segment total deposits:
RBWM$37,009 NR$32,612 NR
WPBNR$44,553 NR$41,806 
CMB29,632 29,986 23,604 23,938 
GBM27,605 29,050 30,181 31,627 
PB6,539 NR8,193 NR
CC2,804 — 2,781 — 
(1)Segment total assets included goodwill that was previously allocated to RBWM and PB of $372 million and $321 million, respectively, at December 31, 2019 and $581 million and $321 million, respectively, at December 31, 2018.
NR Not Reported
Summary on Reconciliation of Results under Group Reporting Basis to US GAAP
The following table summarizes the results for each segment on a Group Reporting Basis, as well as provides a reconciliation of total results under the Group Reporting Basis to U.S. GAAP consolidated totals:
 Group Reporting Basis Consolidated Amounts   
WPBCMBGBMCCTotal
Group Reporting Basis
Adjustments(1)
Group Reporting Basis
Reclassi-
fications(2)
U.S. GAAP
Consolidated
Totals
 (in millions)
Year Ended December 31, 2020
Net interest income (expense)$837 $821 $398 $(30)$2,026 $9 $139 $2,174 
Other operating income368 234 970 129 1,701 (46)(120)1,535 
Total operating income1,205 1,055 1,368 99 3,727 (37)19 3,709 
Expected credit losses /
provision for credit losses		189 293 140 — 622 188 — 810 
1,016 762 1,228 99 3,105 (225)19 2,899 
Operating expenses2,203 587 841 403 4,034 (172)19 3,881 
Profit (loss) before income tax$(1,187)$175 $387 $(304)$(929)$(53)$— $(982)
Balances at end of period:
Total assets$59,200 $36,354 $132,363 $1,760 $229,677 $(33,243)$— $196,434 
Total loans, net24,048 23,377 12,064 — 59,489 (2,307)3,891 61,073 
Goodwill— 358 — — 358 100 — 458 
Total deposits50,000 42,369 44,668 — 137,037 (4,253)12,366 145,150 
Year Ended December 31, 2019
Net interest income (expense)$1,018 $829 $521 $(65)$2,303 $13 $(204)$2,112 
Other operating income330 239 900 68 1,537 102 215 1,854 
Total operating income1,348 1,068 1,421 3 3,840 115 11 3,966 
Expected credit losses /
provision for credit losses		115 55 1 — 171 32 (8)195 
1,233 1,013 1,420 3 3,669 83 19 3,771 
Operating expenses1,645 581 849 238 3,313 169 19 3,501 
Profit (loss) before income tax$(412)$432 $571 $(235)$356 $(86)$— $270 
Balances at end of period:
Total assets$50,851 $34,241 $126,710 $2,421 $214,223 $(38,848)$— $175,375 
Total loans, net24,243 24,647 17,559 — 66,449 (2,965)4,432 67,916 
Goodwill693 358 — — 1,051 191 — 1,242 
Total deposits44,553 29,986 29,050 — 103,589 (4,747)20,851 119,693 
Year Ended December 31, 2018
Net interest income (expense)$1,132 $821 $712 $(106)$2,559 $(16)$(291)$2,252 
Other operating income394 234 788 188 1,604 (9)304 1,899 
Total operating income1,526 1,055 1,500 82 4,163 (25)13 4,151 
Expected credit losses /
provision for credit losses		35 (42)(192)— (199)115 11 (73)
1,491 1,097 1,692 82 4,362 (140)2 4,224 
Operating expenses1,538 595 858 642 3,633 3 2 3,638 
Profit (loss) before income tax$(47)$502 $834 $(560)$729 $(143)$— $586 
Balances at end of period:
Total assets$53,298 $34,214 $112,911 $2,952 $203,375 $(30,927)$— $172,448 
Total loans, net23,209 24,105 19,726 — 67,040 (2,428)3,825 68,437 
Goodwill902 358 — — 1,260 347 — 1,607 
Total deposits41,806 23,938 31,627 — 97,371 (2,017)15,601 110,955 
(1)Represents adjustments associated with differences between U.S. GAAP and the Group Reporting Basis. These adjustments, which are more fully described above, consist of the following:
Net
Interest
Income		Other
Revenues		Provision
for Credit
Losses		Operating
Expenses		Profit (Loss)
before Income
Tax Expense		Total
Assets
(in millions)
December 31, 2020
Deposit incentives$14 $— $— $21 $(7)$(28)
Derivatives— — — — — (33,163)
Expected credit losses(4)— 200 — (204)(357)
Goodwill impairment— — — 91 (91)100 
Leases23 — — 14 9 33 
Loan origination(24)(2)— (20)(6)18 
Loans held for sale— (25)(12)— (13)— 
Other long-lived assets impairment— — — (264)264 201 
Pension and other postretirement benefit costs— — — (15)15 — 
Renewable energy tax credit investments— (11)— — (11)2 
Securities transferred to held-to-maturity— — — — — (38)
Other— (8)— 1 (9)(11)
Total adjustments$9 $(46)$188 $(172)$(53)$(33,243)
December 31, 2019
Debt extinguishment$— $123 $— $— $123 $— 
Deposit incentives15 — — 32 (17)(23)
Derivatives— — — — — (38,651)
Expected credit losses(3)(1)32 — (36)(357)
Goodwill impairment— — — 156 (156)191 
Leases25 — — 8 17 15 
Loan origination(27)— — (19)(8)38 
Loans held for sale2 (1)— — 1 (5)
Pension and other postretirement benefit costs— — — (12)12 — 
Renewable energy tax credit investments— (7)— — (7)3 
Securities transferred to held-to-maturity— — — — — (65)
Other1 (12)— 4 (15)6 
Total adjustments$13 $102 $32 $169 $(86)$(38,848)
December 31, 2018
Deposit incentives$9 $— $— $20 $(11)$(10)
Derivatives— — — — — (30,866)
Expected credit losses(6)— 118 — (124)(386)
Goodwill— — — — — 347 
Loan origination(29)(3)— (14)(18)45 
Loans held for sale9 6 (3)— 18 45 
Pension and other postretirement benefit costs— — — 8 (8)(44)
Renewable energy tax credit investments— (10)— — (10)3 
Securities transferred to held-to-maturity— — — — — (76)
Other1 (2)— (11)10 15 
Total adjustments$(16)$(9)$115 $3 $(143)$(30,927)
(2)Represents differences in financial statement presentation between U.S. GAAP and the Group Reporting Basis.