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Commitments (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments and Guarantees [Abstract]  
Commitments to Extend Credit and Other Commitments The following table presents our outstanding commitments to extend credit along with other commitments as of December 31, 2020 and 2019.
Table 76: Commitments to Extend Credit and Other Commitments
In millionsDecember 31 2020December 31
2019
Commitments to extend credit
Total commercial lending$153,089 $131,762 
Home equity lines of credit16,626 16,803 
Credit card31,019 30,862 
Other7,087 6,162 
Total commitments to extend credit207,821 185,589 
Net outstanding standby letters of credit (a)9,053 9,843 
Reinsurance agreements (b)1,393 
Standby bond purchase agreements (c)1,448 1,295 
Other commitments (d)2,046 1,498 
Total commitments to extend credit and other commitments$220,368 $199,618 
(a)Net outstanding standby letters of credit include $3.8 billion and $4.1 billion at December 31, 2020 and 2019, which support remarketing programs.
(b)Represents aggregate maximum exposure up to the specified limits of the reinsurance contracts provided by our wholly-owned captive insurance subsidiary. These amounts reflect estimates based on availability of financial information from insurance carriers. As of December 31, 2020, the aggregate maximum exposure amount for reinsurance agreements was zero as all underlying insurance policies were cancelled and/or sold.
(c)We enter into standby bond purchase agreements to support municipal bond obligations.
(d)Includes $1.1 billion and $0.6 billion related to investments in qualified affordable housing projects at December 31, 2020 and 2019, respectively.