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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2019
Investments [Abstract]  
Summary Of Investment Securities
September 30, 2019
(In millions)Amortized
cost		Gross unrealized gainsGross unrealized lossesEstimated
fair value
Held-to-maturity
Municipal securities$658  $5  $1  $662  
Available-for-sale
U.S. Treasury securities25  —  —  25  
U.S. Government agencies and corporations:
Agency securities1,277  7  3  1,281  
Agency guaranteed mortgage-backed securities9,700  94  51  9,743  
Small Business Administration loan-backed securities1,656  1  42  1,615  
Municipal securities1,310  34  —  1,344  
Other debt securities26  —  1  25  
Total available-for-sale13,994  136  97  14,033  
Total investment securities$14,652  $141  $98  $14,695  
December 31, 2018
(In millions)Amortized
cost		Gross unrealized gainsGross unrealized lossesEstimated
fair value
Held-to-maturity
Municipal securities$774  $4  $11  $767  
Available-for-sale
U.S. Treasury securities40  —  —  40  
U.S. Government agencies and corporations:
Agency securities1,394  —  19  1,375  
Agency guaranteed mortgage-backed securities10,236  18  240  10,014  
Small Business Administration loan-backed securities2,042  1  47  1,996  
Municipal securities1,303  4  16  1,291  
Other debt securities25  —  4  21  
Total available-for-sale debt securities15,040  23  326  14,737  
Total investment securities$15,814  $27  $337  $15,504  
Contractual Maturities Debt Securities
September 30, 2019
Held-to-maturityAvailable-for-sale
(In millions)Amortized
cost		Estimated
fair value		Amortized
cost		Estimated
fair value
Due in one year or less$121  $121  $172  $173  
Due after one year through five years241  242  642  647  
Due after five years through ten years171  174  2,631  2,649  
Due after ten years125  125  10,549  10,564  
Total debt investment securities$658  $662  $13,994  $14,033  
Summary Of Amount Of Gross Unrealized Losses For Debt Securities And Estimated Fair Value
September 30, 2019
Less than 12 months12 months or moreTotal
(In millions)Gross
unrealized
losses		Estimated
fair
value		Gross
unrealized
losses		Estimated
fair
value		Gross
unrealized
losses		Estimated
fair
value
Held-to-maturity
Municipal securities$—  $256  $1  $54  $1  $310  
Available-for-sale
U.S. Government agencies and corporations:
Agency securities—  117  3  366  3  483  
Agency guaranteed mortgage-backed securities3  973  48  3,447  51  4,420  
Small Business Administration loan-backed securities1  177  41  1,318  42  1,495  
Municipal securities—  122  —  7  —  129  
Other—  —  1  14  1  14  
Total available-for-sale4  1,389  93  5,152  97  6,541  
Total investment securities$4  $1,645  $94  $5,206  $98  $6,851  
December 31, 2018
Less than 12 months12 months or moreTotal
(In millions)Gross
unrealized
losses		Estimated
fair
value		Gross
unrealized
losses		Estimated
fair
value		Gross
unrealized
losses		Estimated
fair
value
Held-to-maturity
Municipal securities$1  $86  $10  $438  $11  $524  
Available-for-sale
U.S. Government agencies and corporations:
Agency securities2  245  17  913  19  1,158  
Agency guaranteed mortgage-backed securities16  1,081  224  6,661  240  7,742  
Small Business Administration loan-backed securities19  1,180  28  711  47  1,891  
Municipal securities2  266  14  641  16  907  
Other—  —  4  11  4  11  
Total available-for-sale39  2,772  287  8,937  326  11,709  
Total investment securities$40  $2,858  $297  $9,375  $337  $12,233  
Gains And Losses, Including OTTI, Recognized In Statement Of Income
Three Months Ended September 30,Nine Months Ended September 30,
2019201820192018
(In millions)Gross gainsGross lossesGross gainsGross lossesGross gainsGross lossesGross gainsGross losses
Other noninterest-bearing investments$2  $—  $4  $5  $7  $7  $9  $10  
Net gains (losses) 1
$2  $(1) $—  $(1) 
1 Net gains (losses) were recognized in securities gains (losses), net in the statement of income.
Tax and Nontaxable Interest Income by Investment Type [Table Text Block]
Three Months Ended September 30,
20192018
(In millions)TaxableNontaxableTotalTaxableNontaxableTotal
Investment securities:
Held-to-maturity$3  $3  $6  $3  $4  $7  
Available-for-sale74  7  81  73  6  79  
Trading—  1  1  —  —  —  
Total securities$77  $11  $88  $76  $10  $86  
Nine Months Ended September 30,
20192018
(In millions)TaxableNontaxableTotalTaxableNontaxableTotal
Investment securities:
Held-to-maturity$7  $11  $18  $8  $11  $19  
Available-for-sale238  19  257  216  19  235  
Trading—  4  4  —  3  3  
Total$245  $34  $279  $224  $33  $257