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Business Segments (Tables)
3 Months Ended
Mar. 31, 2021
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 as of and for the three months ended March 31, 2020:
As Previously ReportedAfter Reporting Changes
(in millions)
Segment profit (loss) before tax during the three months ended March 31, 2020:
RBWM$(546)NR
WPBNR$(869)
CMB(3)(2)
GBM43 45 
PB(323)NR
CC(169)(172)
Segment total assets at March 31, 2020:
RBWM$18,954 NR
WPBNR$58,246 
CMB31,540 42,882 
GBM114,802 165,838 
PB7,159 NR
CC97,154 2,643 
Segment total deposits at March 31, 2020:
RBWM$39,083 NR
WPBNR$48,800 
CMB32,309 32,844 
GBM40,417 42,671 
PB8,201 NR
CC4,305 — 
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)
Three Months Ended March 31, 2021
Net interest income (expense)$209 $190 $95 $(1)$493 $4 $34 $531 
Other operating income87 66 246 11 410 5 (31)384 
Total operating income296 256 341 10 903 9 3 915 
Expected credit losses /
provision for credit losses
(2)(38)(51) (91)(136) (227)
298 294 392 10 994 145 3 1,142 
Operating expenses287 150 201 31 669 10 3 682 
Profit (loss) before income tax$11 $144 $191 $(21)$325 $135 $ $460 
Balances at end of period:
Total assets$63,747 $44,170 $110,524 $1,508 $219,949 $(25,093)$ $194,856 
Total loans, net24,513 22,785 11,676  58,974 (1,367)3,066 60,673 
Goodwill 358   358 100  458 
Total deposits49,578 42,874 48,687  141,139 (4,472)11,915 148,582 
Three Months Ended March 31, 2020
Net interest income (expense)$232 $210 $90 $(13)$519 $$(18)$504 
Other operating income (expense)74 58 263 (24)371 (4)20 387 
Total operating income (expense)306 268 353 (37)890 (1)891 
Expected credit losses /
provision for credit losses
140 123 116 — 379 347 — 726 
166 145 237 (37)511 (348)165 
Operating expenses1,035 147 192 135 1,509 94 1,605 
Profit (loss) before income tax$(869)$(2)$45 $(172)$(998)$(442)$— $(1,440)
Balances at end of period:
Total assets$58,246 $42,882 $165,838 $2,643 $269,609 $(64,532)$— $205,077 
Total loans, net24,478 30,615 23,562 — 78,655 (4,596)6,738 80,797 
Goodwill— 358 — — 358 100 — 458 
Total deposits48,800 32,844 42,671 — 124,315 (7,066)19,474 136,723 
(1)Represents adjustments associated with differences between U.S. GAAP and the Group Reporting Basis.
(2)Represents differences in financial statement presentation between U.S. GAAP and the Group Reporting Basis.