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Operating Leases, Future Aggregate Minimum Rental Payments (Tables)
 12 Months Ended
Dec. 31, 2019
Operating Leased Assets [Line Items]  
Summary of Unfunded Commitments and Redemption [Table Text Block]
December 31,
(In millions)20192018
Net unfunded commitments to extend credit 1
$23,099  $21,454  
Standby letters of credit:
Financial631  655  
Performance192  199  
Commercial letters of credit5  18  
Total unfunded lending commitments$23,927  $22,326  
1Net of participations