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Long-term debt (Tables)
12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Summary of Long-Term Debt

Long-term debt
Dec. 31, 2019
 
Dec. 31, 2018
(in millions)
Rate
Maturity
Amount

 
Rate
Amount

Senior debt:
 
 
 
 
 
 
Fixed rate
1.95 - 4.60%
2020 - 2028
$
23,519

 
2.05 - 5.45%
$
24,995

Floating rate
1.71 - 2.96%
2020 - 2038
2,328

 
2.61 - 3.86%
2,628

Subordinated debt (a)
3.00 - 7.50%
2021 - 2029
1,654

 
3.00 - 7.50%
1,540

Total
 
 
$
27,501

 
 
$
29,163

(a)
Fixed rate.