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Capital Adequacy (Tables)
 3 Months Ended
Mar. 31, 2020
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]  
Schedule of Minimum and Well-Capitalized Requirements
The following table shows the actual capital amounts and ratios of the Company and Discover Bank and comparisons of each to the regulatory minimum and "well-capitalized" requirements (dollars in millions): 
 
Actual
 
Minimum Capital
Requirements
 
Capital Requirements
To Be Classified as
Well-Capitalized
 
Amount
 
Ratio(1)
 
Amount
 
Ratio
 
Amount(2)
 
Ratio(2)
March 31, 2020
 
 
 
 
 
 
 
 
 
 
 
Total capital (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
Discover Financial Services
$
12,947

 
13.7
%
 
$
7,586

 
≥8.0%
 
$
9,482

 
≥10.0%
Discover Bank
$
13,095

 
14.0
%
 
$
7,508

 
≥8.0%
 
$
9,385

 
≥10.0%
Tier 1 capital (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
Discover Financial Services
$
11,309

 
11.9
%
 
$
5,689

 
≥6.0%
 
$
5,689

 
≥6.0%
Discover Bank
$
10,966

 
11.7
%
 
$
5,631

 
≥6.0%
 
$
7,508

 
≥8.0%
Tier 1 capital (to average assets)
 
 
 
 
 
 
 
 
 
 
 
Discover Financial Services
$
11,309

 
9.9
%
 
$
4,578

 
≥4.0%
 
N/A

 
N/A
Discover Bank
$
10,966

 
9.7
%
 
$
4,529

 
≥4.0%
 
$
5,661

 
≥5.0%
Common Equity Tier 1 (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
Discover Financial Services
$
10,746

 
11.3
%
 
$
4,267

 
≥4.5%
 
N/A

 
N/A
Discover Bank
$
10,966

 
11.7
%
 
$
4,223

 
≥4.5%
 
$
6,100

 
≥6.5%
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2019
 
 
 
 
 
 
 
 
 
 
 
Total capital (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
Discover Financial Services
$
13,250

 
13.5
%
 
$
7,860

 
≥8.0%
 
$
9,825

 
≥10.0%
Discover Bank
$
13,441

 
13.8
%
 
$
7,776

 
≥8.0%
 
$
9,720

 
≥10.0%
Tier 1 capital (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
Discover Financial Services
$
11,595

 
11.8
%
 
$
5,895

 
≥6.0%
 
$
5,895

 
≥6.0%
Discover Bank
$
11,203

 
11.5
%
 
$
5,832

 
≥6.0%
 
$
7,776

 
≥8.0%
Tier 1 capital (to average assets)
 
 
 
 
 
 
 
 
 
 
 
Discover Financial Services
$
11,595

 
10.3
%
 
$
4,482

 
≥4.0%
 
N/A

 
N/A
Discover Bank
$
11,203

 
10.1
%
 
$
4,435

 
≥4.0%
 
$
5,544

 
≥5.0%
Common Equity Tier 1 (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
Discover Financial Services
$
11,032

 
11.2
%
 
$
4,421

 
≥4.5%
 
N/A

 
N/A
Discover Bank
$
11,203

 
11.5
%
 
$
4,374

 
≥4.5%
 
$
6,318

 
≥6.5%
 
 
 
 
 
 
 
 
 
 
 
 
(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.