DISCONTINUED OPERATIONS, SIGNIFICANT DISPOSALS AND OTHER BUSINESS EXITS - Income before Taxes, Assets and Liabilities Held-for-Sale (Details) - USD ($) $ in Millions	3 Months Ended		5 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Australia Consumer Banking Business | Discontinued Operations, Held-for-sale
Results of Discontinued Operations
Income before taxes	$ 164	$ 73
Assets
Cash and deposits with banks	18
Loans	9,370
Goodwill	257
Other assets, advances to/from subsidiaries	0
Other assets	105
Total assets	9,750
Allowance	145
Liabilities
Deposits	7,098
Long-term debt	451
Other liabilities	147
Total liabilities	7,696
Pretax loss on sale of business	118
Loss on sale of business, after-tax	81
Loss on sale of business, foreign currency translation adjustments	625
Loss on sale of business, foreign currency translation adjustments, after-tax	475
Australia Consumer Banking Business | Discontinued Operations, Disposed of by Sale
Liabilities
Pretax loss on sale of business			$ 700
Loss on sale of business, after-tax			600
Loss on sale of business, foreign currency translation adjustments			625
Loss on sale of business, foreign currency translation adjustments, after-tax			$ 475
Pretax loss on sale due to release of ACL	104
Pretax loss on sale due to contractual adjustments	14
Philippines Consumer Banking Business | Discontinued Operations, Held-for-sale
Results of Discontinued Operations
Income before taxes	40	36
Assets
Cash and deposits with banks	30
Loans	1,161
Goodwill	244
Other assets, advances to/from subsidiaries	570
Other assets	35
Total assets	2,040
Allowance	71
Liabilities
Deposits	1,386
Long-term debt	0
Other liabilities	82
Total liabilities	1,468
Thailand Consumer Banking Business | Discontinued Operations, Held-for-sale
Results of Discontinued Operations
Income before taxes	(11)	48
Assets
Cash and deposits with banks	17
Loans	2,545
Goodwill	157
Other assets, advances to/from subsidiaries	223
Other assets	71
Total assets	3,013
Allowance	71
Liabilities
Deposits	945
Long-term debt	0
Other liabilities	224
Total liabilities	1,169
Taiwan Consumer Banking Business | Discontinued Operations, Held-for-sale
Results of Discontinued Operations
Income before taxes	46	85
Assets
Cash and deposits with banks	103
Loans	8,170
Goodwill	212
Other assets, advances to/from subsidiaries	5,199
Other assets	223
Total assets	13,907
Allowance	66
Liabilities
Deposits	10,733
Long-term debt	0
Other liabilities	220
Total liabilities	10,953
India Consumer Banking Business | Discontinued Operations, Held-for-sale
Results of Discontinued Operations
Income before taxes	72	$ 69
Assets
Cash and deposits with banks	33
Loans	3,669
Goodwill	346
Other assets, advances to/from subsidiaries	2,984
Other assets	129
Total assets	7,161
Allowance	69
Liabilities
Deposits	6,579
Long-term debt	0
Other liabilities	185
Total liabilities	$ 6,764