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Capital Adequacy (Schedule of Minimum and Well-Capitalized Requirements) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Discover Bank [Member]    
Compliance with Regulatory Capital Requirements [Line Items]    
Total capital to risk-weighted assets, actual amount $ 13,029 $ 13,441
Total capital to risk-weighted assets, actual ratio (in percent) [1] 14.50% 13.80%
Total capital to risk-weighted assets, minimum capital requirements, amount $ 7,167 $ 7,776
Total capital to risk-weighted assets, minimum capital requirements, ratio (in percent) 8.00% 8.00%
Total capital to risk-weighted assets, capital requirements to be classified as well-capitalized, amount [2] $ 8,958 $ 9,720
Total capital to risk-weighted assets, capital requirements to be classified as well-capitalized, ratio (in percent) 10.00% 10.00%
Tier I capital to risk-weighted assets, actual amount $ 10,941 $ 11,203
Tier I capital to risk-weighted assets, actual ratio (in percent) [1] 12.20% 11.50%
Tier I capital to risk-weighted assets, minimum capital requirements, amount $ 5,375 $ 5,832
Tier I capital to risk-weighted assets, minimum capital requirements, ratio (in percent) 6.00% 6.00%
Tier I capital to risk-weighted assets, capital requirements to be classified as well-capitalized, amount [2] $ 7,167 $ 7,776
Tier I capital to risk-weighted assets, capital requirements to be classified as well-capitalized, ratio (in percent) 8.00% 8.00%
Tier I capital to average assets, actual amount $ 10,941 $ 11,203
Tier I capital to average assets, actual ratio (in percent) [1] 9.50% 10.10%
Tier I capital to average assets, minimum capital requirements, amount $ 4,597 $ 4,435
Tier I capital to average assets, minimum capital requirements, ratio (in percent) 4.00% 4.00%
Tier I capital to average assets, capital requirements to be classified as well-capitalized, amount [2] $ 5,746 $ 5,544
Tier I capital to average assets, capital requirements to be classified as well-capitalized, ratio (in percent) 5.00% 5.00%
CET1 capital to risk-weighted assets, actual amount $ 10,941 $ 11,203
CET1 capital to risk-weighted assets, actual ratio (in percent) [1] 12.20% 11.50%
CET1 capital to risk-weighted assets, minimum capital requirements, amount $ 4,031 $ 4,374
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] $ 5,823 $ 6,318
CET1 capital to risk-weighted assets, capital requirements to be classified as well-capitalized, ratio (in percent) 6.50% 6.50%
Parent Company [Member]    
Compliance with Regulatory Capital Requirements [Line Items]    
Total capital to risk-weighted assets, actual amount $ 13,367 $ 13,250
Total capital to risk-weighted assets, actual ratio (in percent) [1] 14.70% 13.50%
Total capital to risk-weighted assets, minimum capital requirements, amount $ 7,252 $ 7,860
Total capital to risk-weighted assets, minimum capital requirements, ratio (in percent) 8.00% 8.00%
Total capital to risk-weighted assets, capital requirements to be classified as well-capitalized, amount [2] $ 9,065 $ 9,825
Total capital to risk-weighted assets, capital requirements to be classified as well-capitalized, ratio (in percent) [2] 10.00% 10.00%
Tier I capital to risk-weighted assets, actual amount $ 11,665 $ 11,595
Tier I capital to risk-weighted assets, actual ratio (in percent) [1] 12.90% 11.80%
Tier I capital to risk-weighted assets, minimum capital requirements, amount $ 5,439 $ 5,895
Tier I capital to risk-weighted assets, minimum capital requirements, ratio (in percent) 6.00% 6.00%
Tier I capital to risk-weighted assets, capital requirements to be classified as well-capitalized, amount [2] $ 5,439 $ 5,895
Tier I capital to risk-weighted assets, capital requirements to be classified as well-capitalized, ratio (in percent) [2] 6.00% 6.00%
Tier I capital to average assets, actual amount $ 11,665 $ 11,595
Tier I capital to average assets, actual ratio (in percent) [1] 10.00% 10.30%
Tier I capital to average assets, minimum capital requirements, amount $ 4,645 $ 4,482
Tier I capital to average assets, minimum capital requirements, ratio (in percent) 4.00% 4.00%
CET1 capital to risk-weighted assets, actual amount $ 10,609 $ 11,032
CET1 capital to risk-weighted assets, actual ratio (in percent) [1] 11.70% 11.20%
CET1 capital to risk-weighted assets, minimum capital requirements, amount $ 4,079 $ 4,421
CET1 capital to risk-weighted assets, minimum capital requirements, ratio (in percent) 4.50% 4.50%
[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.