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Business Segment Information
 9 Months Ended
Sep. 30, 2020
Segment Reporting [Abstract]  
Segment Reporting Disclosure [Text Block] BUSINESS SEGMENT INFORMATION
The Corporation has strategically aligned its operations into three major business segments: the Commercial Bank, the Retail Bank and Wealth Management. These business segments are differentiated based on the type of customer and the related products and services provided. In addition to the three major business segments, the Finance Division is also reported as a segment. Business segment results are produced by the Corporation’s internal management accounting system. This system measures financial results based on the internal business unit structure of the Corporation. The performance of the business segments is not comparable with the Corporation's consolidated results and is not necessarily comparable with similar information for any other financial institution. Additionally, because of the interrelationships of the various segments, the information presented is not indicative of how the segments would perform if they operated as independent entities. The management accounting system assigns balance sheet and income statement items to each business segment using certain methodologies, which are regularly reviewed and refined. From time to time, the Corporation may make reclassifications among the segments to more appropriately reflect management's current view of the segments, and methodologies may be modified as the management accounting system is enhanced and changes occur in the organizational structure and/or product lines. For comparability purposes, amounts in all periods are based on business unit structure and methodologies in effect at September 30, 2020.
The following discussion provides information about the activities of each business segment. A discussion of the financial results and the factors impacting performance can be found in the section entitled "Business Segments" in the financial review.
The Commercial Bank meets the needs of small and middle market businesses, multinational corporations and governmental entities by offering various products and services including commercial loans and lines of credit, deposits, cash management, capital market products, international trade finance, letters of credit, foreign exchange management services and loan syndication services.
The Retail Bank includes a full range of personal financial services, consisting of consumer lending, consumer deposit gathering and mortgage loan origination. This business segment offers a variety of consumer products including deposit accounts, installment loans, credit cards, student loans, home equity lines of credit and residential mortgage loans. In addition, this business segment offers a subset of commercial products and services to micro-businesses whose primary contact is through the branch network.
Wealth Management offers products and services consisting of fiduciary services, private banking, retirement services, investment management and advisory services, investment banking and brokerage services. This business segment also offers the sale of annuity products, as well as life, disability and long-term care insurance products.
The Finance segment includes the Corporation’s securities portfolio and asset and liability management activities. This segment is responsible for managing the Corporation’s funding, liquidity and capital needs, performing interest sensitivity analysis and executing various strategies to manage the Corporation’s exposure to liquidity, interest rate risk and foreign exchange risk.
The Other category includes the income and expense impact of equity and cash, tax benefits not assigned to specific business segments, charges of an unusual or infrequent nature that are not reflective of the normal operations of the business segments and miscellaneous other expenses of a corporate nature.
For further information on the methodologies which form the basis for these results refer to Note 22 to the consolidated financial statements in the Corporation's 2019 Annual Report.
Business segment financial results are as follows:
Commercial
Bank		Retail
Bank		Wealth ManagementFinanceOtherTotal
(dollar amounts in millions)
Three Months Ended September 30, 2020
Earnings summary:
Net interest income (expense)$413 $127 $42 $(125)$1 $458 
Provision for credit losses14 (2)(7)— — 5 
Noninterest income135 28 64 16 9 252 
Noninterest expenses206 153 76 — 11 446 
Provision (benefit) for income taxes67 — 8 (26)(1)48 
Net income (loss)$261 $4 $29 $(83)$— $211 
Net credit-related charge-offs (recoveries)$36 $(1)$(2)$— $— $33 
Selected average balances:
Assets $45,636 $3,487 $5,198 $15,909 $14,038 $84,268 
Loans 44,248 2,678 5,094 — (7)52,013 
Deposits39,535 23,604 4,439 1,004 181 68,763 
Statistical data:
Return on average assets (a)2.27 %0.05 %2.24 %n/mn/m0.99 %
Efficiency ratio (b)37.60 98.29 71.72 n/mn/m62.79 
Three Months Ended September 30, 2019
Earnings summary:
Net interest income (expense)$420 $142 $47 $(38)$15 $586 
Provision for credit losses39 (2)(3)— 1 35 
Noninterest income140 31 69 12 4 256 
Noninterest expenses199 149 69 (1)19 435 
Provision (benefit) for income taxes74 5 12 (8)(3)80 
Net income (loss)$248 $21 $38 $(17)$2 $292 
Net credit-related charge-offs (recoveries)$43 $1 $(2)$— $— $42 
Selected average balances:
Assets$45,460 $2,871 $5,032 $14,061 $4,312 $71,736 
Loans43,904 2,114 4,884 — (15)50,887 
Deposits28,917 20,761 3,775 2,049 214 55,716 
Statistical data:
Return on average assets (a)2.17 %0.39 %3.01 %n/mn/m1.61 %
Efficiency ratio (b)35.62 84.54 59.79 n/mn/m51.54 
(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 losses from securities and a derivative contract tied to the conversion rate of Visa Class B shares.
n/m – not meaningful
Commercial BankRetail BankWealth ManagementFinanceOtherTotal
(dollar amounts in millions)
Nine Months Ended September 30, 2020
Earnings summary:
Net interest income (expense)$1,195 $372 $123 $(264)$16 $1,442 
Provision for credit losses527 6 21 — — 554 
Noninterest income406 80 200 41 9 736 
Noninterest expenses607 457 221 1 25 1,311 
Provision (benefit) for income taxes94 (4)17 (54)1 54 
Net income (loss)$373 $(7)$64 $(170)$(1)$259 
Net credit-related charge-offs (recoveries)$167 $1 $(1)$— $— $167 
Selected average balances:
Assets $45,764 $3,221 $5,156 $14,902 $10,699 $79,742 
Loans 44,256 2,413 5,035 — 2 51,706 
Deposits35,376 22,486 4,228 1,030 171 63,291 
Statistical data:
Return on average assets (a)1.09 %(0.04)%1.65 %n/mn/m0.43 %
Efficiency ratio (b)37.89 100.27 68.54 n/mn/m60.10 
Nine Months Ended September 30, 2019
Earnings summary:
Net interest income (expense)$1,252 $434 $140 $(75)$44 $1,795 
Provision for credit losses85 (5)(13)— (1)66 
Noninterest income412 95 201 29 7 744 
Noninterest expenses592 441 208 — 51 1,292 
Provision (benefit) for income taxes227 21 35 (16)(15)252 
Net income (loss)$760 $72 $111 $(30)$16 $929 
Net credit-related charge-offs (recoveries)$90 $1 $(5)$— $— $86 
Selected average balances:
Assets$44,902 $2,841 $5,092 $13,853 $4,239 $70,927 
Loans43,465 2,108 4,950 — (9)50,514 
Deposits28,545 20,628 3,772 1,788 176 54,909 
Statistical data:
Return on average assets (a)2.26 %0.46 %2.92 %n/mn/m1.75 %
Efficiency ratio (b)35.61 82.70 61.04 n/mn/m50.66 
(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 losses from securities and a derivative contract tied to the conversion rate of Visa Class B shares.
n/m – not meaningful

The Corporation operates in three primary markets - Texas, California and Michigan, as well as in Arizona and Florida, with select businesses operating in several other states and in Canada and Mexico. The Corporation produces market segment results for the Corporation’s three primary geographic markets as well as Other Markets. Other Markets includes Florida, Arizona, the International Finance division and businesses with a national perspective. The Finance & Other category includes the Finance segment and the Other category as previously described. Market segment results are provided as supplemental information to the business segment results and may not meet all operating segment criteria as set forth in GAAP. For comparability purposes, amounts in all periods are based on market segments and methodologies in effect at September 30, 2020.
A discussion of the financial results and the factors impacting performance can be found in the section entitled "Market Segments" in the financial review.
Market segment financial results are as follows:
MichiganCaliforniaTexasOther
Markets		Finance
& Other		Total
(dollar amounts in millions)
Three Months Ended September 30, 2020
Earnings summary:
Net interest income (expense)$168 $179 $117 $118 $(124)$458 
Provision for credit losses19 11 (25)— — 5 
Noninterest income66 33 28 100 25 252 
Noninterest expenses139 102 89 105 11 446 
Provision (benefit) for income taxes13 21 17 24 (27)48 
Net income (loss)$63 $78 $64 $89 $(83)$211 
Net credit-related charge-offs$6 $16 $11 $— $— $33 
Selected average balances:
Assets $13,280 $18,357 $11,365 $11,322 $29,944 $84,268 
Loans 12,607 18,095 10,923 10,399 (11)52,013 
Deposits24,759 20,130 10,654 12,035 1,185 68,763 
Statistical data:
Return on average assets (a)0.95 %1.46 %2.14 %2.68 %n/m0.99 %
Efficiency ratio (b)59.79 47.98 61.16 48.22 n/m62.79 
Three Months Ended September 30, 2019
Earnings summary:
Net interest income (expense)$185 $203 $125 $96 $(23)$586 
Provision for credit losses(1)(6)50 (9)1 35 
Noninterest income74 41 31 94 16 256 
Noninterest expenses139 102 86 90 18 435 
Provision (benefit) for income taxes27 37 5 22 (11)80 
Net income (loss)$94 $111 $15 $87 $(15)$292 
Net credit-related charge-offs (recoveries)$6 $5 $34 $(3)$— $42 
Selected average balances:
Assets$13,205 $18,595 $11,462 $10,100 $18,374 $71,736 
Loans12,554 18,261 10,805 9,282 (15)50,887 
Deposits20,164 16,705 8,705 7,879 2,263 55,716 
Statistical data:
Return on average assets (a)1.79 %2.37 %0.48 %3.45 %n/m1.61 %
Efficiency ratio (b)53.30 41.70 55.57 47.08 n/m51.54 
(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 losses from securities and a derivative contract tied to the conversion rate of Visa Class B shares.
n/m – not meaningful.
MichiganCaliforniaTexasOther MarketsFinance & OtherTotal
(dollar amounts in millions)
Nine Months Ended September 30, 2020
Earnings summary:
Net interest income (expense)$490 $537 $348 $315 $(248)$1,442 
Provision for credit losses83 113 296 62 — 554 
Noninterest income202 105 88 291 50 736 
Noninterest expenses418 303 264 300 26 1,311 
Provision (benefit) for income taxes36 51 (29)49 (53)54 
Net income (loss)$155 $175 $(95)$195 $(171)$259 
Net credit-related charge-offs$9 $31 $127 $— $— $167 
Selected average balances:
Assets $13,272 $18,563 $11,369 $10,943 $25,595 $79,742 
Loans 12,604 18,263 10,889 9,955 (5)51,706 
Deposits22,995 18,691 10,026 10,378 1,201 63,291 
Statistical data:
Return on average assets (a)0.86 %1.18 %(1.10)%2.28 %n/m0.43 %
Efficiency ratio (b)60.20 47.16 60.41 49.60 n/m60.10 
Nine Months Ended September 30, 2019
Earnings summary:
Net interest income (expense)$558 $614 $373 $281 $(31)$1,795 
Provision for credit losses(6)(11)88 (4)(1)66 
Noninterest income218 121 97 272 36 744 
Noninterest expenses412 301 255 273 51 1,292 
Provision (benefit) for income taxes83 113 30 57 (31)252 
Net income (loss)$287 $332 $97 $227 $(14)$929 
Net credit-related charge-offs (recoveries)$10 $9 $73 $(6)$— $86 
Selected average balances:
Assets$13,170 $18,877 $11,240 $9,548 $18,092 $70,927 
Loans12,605 18,572 10,586 8,760 (9)50,514 
Deposits19,959 16,420 8,690 7,876 1,964 54,909 
Statistical data:
Return on average assets (a)1.85 %2.36 %1.13 %3.20 %n/m1.75 %
Efficiency ratio (b)53.00 40.89 54.35 49.20 n/m50.66 
(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 losses from securities and a derivative contract tied to the conversion rate of Visa Class B shares.
n/m – not meaningful.