v3.21.2
Loans - Summary of Consumer Loans by Refreshed FICO Credit Score (Detail) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Financing Receivable, Recorded Investment [Line Items]    
Total loans, gross $ 133,808 $ 119,989
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score 100.00% 100.00%
FICO [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans, gross $ 8,467 $ 8,093
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score 100.00% 100.00%
Installment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans, gross $ 3,257 $ 3,823
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score 100.00% 100.00%
Installment [Member] | FICO [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2021 and 2020 $ 679 $ 1,359
2020 and 2019 1,026 1,357
2019 and 2018 921 942
2018 and 2017 545 158
2017 and 2016 82 7
2016 4  
Total loans, gross $ 3,257 $ 3,823
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score 100.00% 100.00%
Credit card [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans, gross $ 5,210 $ 4,270
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score 100.00% 100.00%
Credit card [Member] | FICO [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans, gross $ 5,210 $ 4,270
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score 100.00% 100.00%
Greater than or equal to 660 [Member] | FICO [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans, gross $ 7,119 $ 6,870
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score 84.00% 85.00%
Greater than or equal to 660 [Member] | Installment [Member] | FICO [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2021 and 2020 $ 674 $ 1,321
2020 and 2019 988 1,225
2019 and 2018 837 792
2018 and 2017 471 128
2017 and 2016 69 6
2016 3  
Total loans, gross $ 3,042 $ 3,472
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score 93.00% 91.00%
Greater than or equal to 660 [Member] | Credit card [Member] | FICO [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans, gross $ 4,077 $ 3,398
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score 78.00% 80.00%
Less than 660 [Member] | FICO [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans, gross $ 1,348 $ 1,223
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score 16.00% 15.00%
Less than 660 [Member] | Installment [Member] | FICO [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2021 and 2020 $ 5 $ 38
2020 and 2019 38 132
2019 and 2018 84 150
2018 and 2017 74 30
2017 and 2016 13 1
2016 1  
Total loans, gross $ 215 $ 351
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score 7.00% 9.00%
Less than 660 [Member] | Credit card [Member] | FICO [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans, gross $ 1,133 $ 872
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score 22.00% 20.00%