DISCONTINUED OPERATIONS, SIGNIFICANT DISPOSALS AND OTHER BUSINESS EXITS - Income before Taxes, Assets and Liabilities Held-for-Sale (Details) - USD ($) $ in Millions				1 Months Ended	12 Months Ended
	Nov. 01, 2022	Aug. 01, 2022	Jun. 01, 2022	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Australia Consumer Banking Business
Results of Discontinued Operations
Income before taxes					$ 193	$ 306	$ 181
Australia Consumer Banking Business | Discontinued Operations, Held-for-sale
Assets
Cash and deposits with banks					0
Loans					0
Goodwill					0
Other assets, advances to/from subsidiaries					0
Other assets					0
Total assets					0
Liabilities
Deposits					0
Long-term debt					0
Other liabilities					0
Total liabilities					0
Results of Discontinued Operations
Loss on sale of business, foreign currency translation adjustments, pretax				$ 620
Loss on sale of business, foreign currency translation adjustments, after-tax				$ 470
Australia Consumer Banking Business | Discontinued Operations, Disposed of by Sale
Assets
Loans			$ 9,300
Total assets			9,400
Liabilities
Deposits			6,800
Total liabilities			7,300
Results of Discontinued Operations
Loans, allowance for credit losses			140
Pretax gain (loss) on sale			(760)
Gain (loss) on sale, after-tax			$ (640)
Gain (loss) on sale of business, after-tax, location			Other revenue
Loss on sale of business, foreign currency translation adjustments, pretax			$ 620
Loss on sale of business, foreign currency translation adjustments, after-tax			$ 470
Philippines Consumer Banking Business
Results of Discontinued Operations
Income before taxes					72	145	42
Philippines Consumer Banking Business | Discontinued Operations, Held-for-sale
Assets
Cash and deposits with banks					0
Loans					0
Goodwill					0
Other assets, advances to/from subsidiaries					0
Other assets					0
Total assets					0
Liabilities
Deposits					0
Long-term debt					0
Other liabilities					0
Total liabilities					0
Philippines Consumer Banking Business | Discontinued Operations, Disposed of by Sale
Assets
Loans		$ 1,200
Total assets		1,800
Liabilities
Deposits		1,200
Total liabilities		1,300
Results of Discontinued Operations
Loans, allowance for credit losses		80
Pretax gain (loss) on sale		618
Gain (loss) on sale, after-tax		$ 290
Gain (loss) on sale of business, after-tax, location		Other revenue
Thailand Consumer Banking Business
Results of Discontinued Operations
Income before taxes					122	139	93
Thailand Consumer Banking Business | Discontinued Operations, Held-for-sale
Assets
Cash and deposits with banks					0
Loans					0
Goodwill					0
Other assets, advances to/from subsidiaries					0
Other assets					0
Total assets					0
Liabilities
Deposits					0
Long-term debt					0
Other liabilities					0
Total liabilities					0
Thailand Consumer Banking Business | Discontinued Operations, Disposed of by Sale
Assets
Loans	$ 2,400
Total assets	2,700
Liabilities
Deposits	800
Total liabilities	1,000
Results of Discontinued Operations
Loans, allowance for credit losses	67
Pretax gain (loss) on sale	209
Gain (loss) on sale, after-tax	$ 115
Gain (loss) on sale of business, after-tax, location	Other revenue
Taiwan Consumer Banking Business
Results of Discontinued Operations
Income before taxes					140	282	311
Taiwan Consumer Banking Business | Discontinued Operations, Held-for-sale
Assets
Cash and deposits with banks					123
Loans					7,865
Goodwill					202
Other assets, advances to/from subsidiaries					4,758
Other assets					198
Total assets					13,146
Liabilities
Deposits					10,049
Long-term debt					0
Other liabilities					237
Total liabilities					10,286
Results of Discontinued Operations
Loans, allowance for credit losses					64
India Consumer Banking Business
Results of Discontinued Operations
Income before taxes					194	$ 213	$ 117
India Consumer Banking Business | Discontinued Operations, Held-for-sale
Assets
Cash and deposits with banks					25
Loans					3,423
Goodwill					329
Other assets, advances to/from subsidiaries					1,924
Other assets					114
Total assets					5,815
Liabilities
Deposits					5,266
Long-term debt					0
Other liabilities					204
Total liabilities					5,470
Results of Discontinued Operations
Loans, allowance for credit losses					$ 37