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Strategic Lines of Business and Markets (Tables)
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Business Segment Financial Results
Business segment financial results are as follows:
(dollar amounts in millions)Commercial
Bank		Retail
Bank		Wealth ManagementFinanceOtherTotal
Year Ended December 31, 2020
Earnings summary:
Net interest income (expense)$1,608 $502 $167 $(384)$18 $1,911 
Provision for credit losses495 7 35 — — 537 
Noninterest income555 110 263 55 18 1,001 
Noninterest expenses826 619 301 2 36 1,784 
Provision (benefit) for income taxes182 (5)20 (79)(1)117 
Net income (loss)$660 $(9)$74 $(252)$1 $474 
Net credit-related charge-offs$192 $1 $3 $— $— $196 
Selected average balances:
Assets$45,603 $3,281 $5,162 $15,418 $11,682 $81,146 
Loans44,123 2,468 5,045 — (5)51,631 
Deposits36,603 22,832 4,402 1,026 175 65,038 
Statistical data:
Return on average assets (a)1.45 %(0.04)%1.41 %n/mn/m0.58 %
Efficiency ratio (b)38.19 100.48 70.13 n/mn/m61.15 
Year Ended December 31, 2019
Earnings summary:
Net interest income (expense)$1,655 $568 $183 $(123)$56 $2,339
Provision for credit losses88 (4)(14)— 4 74
Noninterest income555 132 270 41 12 1,010
Noninterest expenses795 597 283 1 67 1,743
Provision (benefit) for income taxes306 24 44 (26)(14)334
Net income (loss)$1,021 $83 $140 $(57)$11 $1,198
Net credit-related charge-offs (recoveries)$111 $1 $(5)$— $— $107
Selected average balances:
Assets$44,946 $2,852 $5,083 $13,903 $4,704 $71,488
Loans43,477 2,104 4,935 — (5)50,511
Deposits29,047 20,743 3,833 1,673 185 55,481
Statistical data:
Return on average assets (a)2.27 %0.39 %2.76 %n/mn/m1.68 %
Efficiency ratio (b)35.96 84.49 62.45 n/mn/m51.82 
(Table continues on following page)
(dollar amounts in millions)Commercial BankRetail
Bank		Wealth ManagementFinanceOtherTotal
Year Ended December 31, 2018
Earnings summary:
Net interest income (expense)$1,613 $548 $181 $(41)$51 $2,352 
Provision for credit losses6 (1)(3)— (3)(1)
Noninterest income547 136 266 27 — 976 
Noninterest expenses847 602 293 1 51 1,794 
Provision (benefit) for income taxes283 18 36 (14)(23)300 
Net income (loss)$1,024 $65 $121 $(1)$26 $1,235 
Net credit-related charge-offs (recoveries)$52 $— $(1)$— $— $51 
Selected average balances:
Assets$43,207 $2,633 $5,214 $13,548 $6,122 $70,724 
Loans41,629 2,067 5,081 — (11)48,766 
Deposits30,116 20,812 3,941 941 125 55,935 
Statistical data:
Return on average assets (a)2.37 %0.31 %2.32 %n/mn/m1.75 %
Efficiency ratio (b)39.22 87.59 65.60 n/mn/m53.56 
(a)Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity.
(b)Noninterest expenses as a percentage of the sum of net interest income and noninterest income excluding net gains (losses) from securities and a derivative contract tied to the conversion rate of Visa Class B shares.
n/m – not meaningful
Market Segment Financial Results
Market segment financial results are as follows:
(dollar amounts in millions)MichiganCaliforniaTexasOther
Markets		Finance
& Other		Total
Year Ended December 31, 2020
Earnings summary:
Net interest income (expense)$660 $723 $465 $429 $(366)$1,911 
Provision for credit losses95 134 270 38 — 537 
Noninterest income273 147 120 388 73 1,001 
Noninterest expenses559 414 359 414 38 1,784 
Provision (benefit) for income taxes54 75 (11)79 (80)117 
Net income (loss)$225 $247 $(33)$286 $(251)$474 
Net credit-related charge-offs$14 $31 $151 $— $— $196 
Selected average balances:
Assets$13,179 $18,562 $11,287 $11,020 $27,098 $81,146 
Loans12,509 18,265 10,813 10,052 (8)51,631 
Deposits23,500 19,386 10,209 10,742 1,201 65,038 
Statistical data:
Return on average assets (a)0.92 %1.21 %(0.28)%2.45 %n/m0.58 %
Efficiency ratio (b)59.76 47.58 61.28 50.66 n/m61.15 
(Table continues on following page)
(dollar amounts in millions)MichiganCaliforniaTexasOther
Markets		Finance
& Other		Total
Year Ended December 31, 2019
Earnings summary:
Net interest income (expense)$729 $808 $493 $376 $(67)$2,339 
Provision for credit losses(11)(33)119 (5)474 
Noninterest income291 173 128 365 531,010 
Noninterest expenses554 406 345 370 681,743 
Provision (benefit) for income taxes108 154 38 74 (40)334 
Net income (loss)$369 $454 $119 $302 $(46)$1,198 
Net credit-related charge-offs (recoveries)$11 $8 $93 $(5)$—$107 
Selected average balances:
Assets$13,149 $18,731 $11,269 $9,732 $18,607 $71,488 
Loans12,553 18,413 10,616 8,934 (5)50,511 
Deposits20,081 16,846 8,780 7,916 1,858 55,481 
Statistical data:
Return on average assets (a)1.77 %2.42 %1.06 %3.10 %n/m1.68 %
Efficiency ratio (b)54.01 41.28 55.59 49.90 n/m51.82 
Year Ended December 31, 2018
Earnings summary:
Net interest income$727 $786 $474 $355 $10 $2,352 
Provision for credit losses30 26 (53)(1)(3)(1)
Noninterest income296 164 130 359 27 976 
Noninterest expenses577 424 365 376 52 1,794 
Provision (benefit) for income taxes90 123 64 60 (37)300 
Net income$326 $377 $228 $279 $25 $1,235 
Net credit-related charge-offs$7 $27 $12 $5 $— $51 
Selected average balances:
Assets$13,202 $18,422 $10,380 $9,049 $19,671 $70,724 
Loans12,531 18,161 9,812 8,273 (11)48,766 
Deposits20,770 16,951 8,991 8,157 1,066 55,935 
Statistical data:
Return on average assets (a)1.52 %2.05 %2.20 %3.08 %n/m1.75 %
Efficiency ratio (b)56.21 44.64 60.30 52.82 n/m53.56 
(a)Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity.
(b)Noninterest expenses as a percentage of the sum of net interest income and noninterest income excluding net gains (losses) from securities and a derivative contract tied to the conversion rate of Visa Class B shares.
n/m – not meaningful