v3.24.4
Capital Adequacy (Schedule of Minimum and Well-Capitalized Requirements) (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Parent Company [Member]    
Compliance with Regulatory Capital Requirements [Line Items]    
Total capital to risk-weighted assets, actual amount $ 17,399 $ 17,557
Total capital to risk-weighted assets, actual ratio (in percent) [1] 0.132 0.153
Total capital to risk-weighted assets, minimum capital requirements, amount $ 10,509 $ 9,151
Total capital to risk-weighted assets, minimum capital requirements, ratio (in percent) 0.080 0.080
Total capital to risk-weighted assets, capital requirements to be classified as well-capitalized, amount [2] $ 13,137 $ 11,439
Total capital to risk-weighted assets, capital requirements to be classified as well-capitalized, ratio (in percent) [2] 0.100 0.100
Tier I capital to risk-weighted assets, actual amount $ 15,279 $ 15,590
Tier I capital to risk-weighted assets, actual ratio (in percent) [1] 0.116 0.136
Tier I capital to risk-weighted assets, minimum capital requirements, amount $ 7,882 $ 6,863
Tier I capital to risk-weighted assets, minimum capital requirements, ratio (in percent) 0.060 0.060
Tier I capital to risk-weighted assets, capital requirements to be classified as well-capitalized, amount [2] $ 7,882 $ 6,863
Tier I capital to risk-weighted assets, capital requirements to be classified as well-capitalized, ratio (in percent) [2] 0.060 0.060
Tier I capital to average assets, actual amount $ 15,279 $ 15,590
Tier I capital to average assets, actual ratio (in percent) [1] 0.103 0.121
Tier I capital to average assets, minimum capital requirements, amount $ 5,915 $ 5,147
Tier I capital to average assets, minimum capital requirements, ratio (in percent) 0.040 0.040
CET1 capital to risk-weighted assets, actual amount $ 14,223 $ 14,534
CET1 capital to risk-weighted assets, actual ratio (in percent) [1] 0.108 0.127
CET1 capital to risk-weighted assets, minimum capital requirements, amount $ 5,911 $ 5,148
CET1 capital to risk-weighted assets, minimum capital requirements, ratio (in percent) 4.50% 4.50%
Discover Bank [Member]    
Compliance with Regulatory Capital Requirements [Line Items]    
Total capital to risk-weighted assets, actual amount $ 16,409 $ 15,942
Total capital to risk-weighted assets, actual ratio (in percent) [1] 0.127 0.141
Total capital to risk-weighted assets, minimum capital requirements, amount $ 10,381 $ 9,051
Total capital to risk-weighted assets, minimum capital requirements, ratio (in percent) 0.080 0.080
Total capital to risk-weighted assets, capital requirements to be classified as well-capitalized, amount [2] $ 12,976 $ 11,314
Total capital to risk-weighted assets, capital requirements to be classified as well-capitalized, ratio (in percent) [2] 0.100 0.100
Tier I capital to risk-weighted assets, actual amount $ 13,459 $ 13,040
Tier I capital to risk-weighted assets, actual ratio (in percent) [1] 0.104 0.115
Tier I capital to risk-weighted assets, minimum capital requirements, amount $ 7,786 $ 6,788
Tier I capital to risk-weighted assets, minimum capital requirements, ratio (in percent) 0.060 0.060
Tier I capital to risk-weighted assets, capital requirements to be classified as well-capitalized, amount [2] $ 10,381 $ 9,051
Tier I capital to risk-weighted assets, capital requirements to be classified as well-capitalized, ratio (in percent) [2] 0.080 0.080
Tier I capital to average assets, actual amount $ 13,459 $ 13,040
Tier I capital to average assets, actual ratio (in percent) [1] 0.092 0.103
Tier I capital to average assets, minimum capital requirements, amount $ 5,833 $ 5,086
Tier I capital to average assets, minimum capital requirements, ratio (in percent) 0.040 0.040
Tier I capital to average assets, capital requirements to be classified as well-capitalize, amount [2] $ 7,292 $ 6,357
Tier I capital to average assets, capital requirements to be classified as well-capitalized, ratio (in percent) [2] 0.050 0.050
CET1 capital to risk-weighted assets, actual amount $ 13,459 $ 13,040
CET1 capital to risk-weighted assets, actual ratio (in percent) [1] 0.104 0.115
CET1 capital to risk-weighted assets, minimum capital requirements, amount $ 5,839 $ 5,091
CET1 capital to risk-weighted assets, minimum capital requirements, ratio (in percent) 4.50% 4.50%
CET1 capital to risk-weighted assets, capital requirements to be classified as well-capitalized, amount [2] $ 8,435 $ 7,354
CET1 capital to risk-weighted assets, capital requirements to be classified as well capitalized, ratio (in percent) [2] 6.50% 6.50%
[1] Capital ratios are calculated based on the Basel III standardized approach rules, subject to applicable transition provisions, including CECL transition provisions.
[2] The Basel III rules do not establish well-capitalized thresholds for these measures for bank holding companies. Existing well-capitalized thresholds established in the Federal Reserve’s Regulation Y have been included where available.