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Loan Receivables and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance $ 5,942 $ 5,738 $ 6,427 $ 5,574
Provision for loan losses 1,198 1,280 2,057 2,642
Gross charge-offs (1,598) (1,401) (3,223) (2,800)
Recoveries 267 242 548 443
Ending Balance 5,809 5,859 5,809 5,859
Credit cards        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 5,840 5,640 6,327 5,483
Provision for loan losses 1,169 1,255 2,001 2,589
Gross charge-offs (1,568) (1,375) (3,162) (2,747)
Recoveries 261 237 536 432
Ending Balance 5,702 5,757 5,702 5,757
Consumer installment loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 47 45 44 40
Provision for loan losses 13 14 28 30
Gross charge-offs (14) (12) (31) (27)
Recoveries 4 4 9 8
Ending Balance 50 51 50 51
Commercial credit products        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 54 52 55 50
Provision for loan losses 14 11 26 23
Gross charge-offs (15) (14) (29) (26)
Recoveries 2 1 3 3
Ending Balance 55 50 55 50
Other        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning Balance 1 1 1 1
Provision for loan losses 2 0 2 0
Gross charge-offs (1) 0 (1) 0
Recoveries 0 0 0 0
Ending Balance $ 2 $ 1 $ 2 $ 1