FAIR VALUES OF FINANCIAL INSTRUMENTS - Assets and Liabilities Not Carried at Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Financial assets
Credit card and loan receivables, net	$ 18,156	$ 17,989
Total assets measured at fair value	18,156	17,989
Financial liabilities
Deposits	11,005	11,135
Debt issued by consolidated VIEs	5,498	5,467
Long-term and other debt	1,870	2,053
Total liabilities measured at fair value	18,373	18,655
Level 2
Financial liabilities
Deposits	11,005	11,135
Debt issued by consolidated VIEs	5,498	5,467
Long-term and other debt	1,870	2,053
Total liabilities measured at fair value	18,373	18,655
Level 3
Financial assets
Credit card and loan receivables, net	18,156	17,989
Total assets measured at fair value	$ 18,156	$ 17,989