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STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands |  |  |  |  |  |  |  |  |  | 1 Months Ended | 4 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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Dec. 16, 2022 | Dec. 16, 2022 | Dec. 15, 2022 | Nov. 02, 2022 | Mar. 30, 2022 | Mar. 30, 2022 | Mar. 29, 2022 | Jan. 12, 2022 | May 05, 2021 | May 04, 2021 | Dec. 23, 2020 | Feb. 16, 2023 | Oct. 31, 2022 | Dec. 31, 2020 | May 05, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Feb. 15, 2023 | Nov. 04, 2022 | Nov. 03, 2022 | Jan. 11, 2022 | Feb. 18, 2021 | Dec. 22, 2020 | Jul. 30, 2019
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.79 |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 98,000,000 |  |  |  |  |  |  |  |  |
Share repurchase authorization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000,000 |  | $ 3,000,000,000
Increase in treasury stock from share repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,096,000,000 | $ 79,000,000 | $ 1,820,000,000 |  |  |  |  |  |  |
Remaining authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |
Common shares acquired in connection with employee stock plans (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200 | 200 | 200 |  |  |  |  |  |  |
Common shares acquired in connection with employee stock plans, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 96,000,000 | $ 79,000,000 | $ 70,000,000 |  |  |  |  |  |  |
Aggregate statutory capital and surplus in our state regulated insurance subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,300,000,000 | 9,600,000,000 |  |  |  |  |  |  |  |
Aggregate minimum regulatory requirements of statutory capital and surplus |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,400,000,000 | 7,600,000,000 |  |  |  |  |  |  |  |
Ordinary dividends that may be paid to parent company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,800,000,000 |  |  |  |  |  |  |  |  |
Actual dividends paid to parent company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300,000,000 | $ 1,600,000,000 | $ 1,300,000,000 |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.8850 |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase authorization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000,000 |  |  |  |  |  |
Remaining authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |
December 2020 ASR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase agreement amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,750,000,000 |
Accelerated share repurchase payment |  |  |  |  |  |  |  |  |  |  | $ 1,750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares received (in shares) |  |  |  |  |  |  |  |  |  |  | 3,800 |  |  |  | 4,400 |  |  |  |  |  |  |  |  |  |
Increase in treasury stock from share repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |
Decrease in capital in excess of par value |  |  |  |  |  |  |  |  |  |  | $ 262,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from capital in excess of par value to treasury stock |  |  |  |  |  |  |  |  | $ 262,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 2020 ASR | Citi |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase payment |  |  |  |  |  |  |  |  |  |  | $ 875,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares received (in shares) |  |  |  |  |  |  |  |  |  | 300 | 1,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average daily volume weighted-average share price of common stock during term of agreement (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 400.07 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 2020 ASR | JPM |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase payment |  |  |  |  |  |  |  |  |  |  | $ 875,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares received (in shares) |  |  |  |  |  |  |  |  | 300 |  | 1,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average daily volume weighted-average share price of common stock during term of agreement (in dollars per share) |  |  |  |  |  |  |  |  | $ 401.49 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
January 2022 ASR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase agreement amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |
Accelerated share repurchase payment |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares received (in shares) |  |  |  |  |  |  |  | 2,200 |  |  |  |  |  |  |  | 2,400 |  |  |  |  |  |  |  |  |
Increase in treasury stock from share repurchases |  |  |  |  |  |  |  | $ 850,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in capital in excess of par value |  |  |  |  |  |  |  | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from capital in excess of par value to treasury stock |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
January 2022 ASR | Mizuho Markets Americas LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase payment |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares received (in shares) |  |  |  |  |  |  | 100 | 1,080 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average daily volume weighted-average share price of common stock during term of agreement (in dollars per share) |  |  |  |  |  |  | $ 410.96 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
January 2022 ASR | Wells Fargo Bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase payment |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares received (in shares) |  |  |  |  | 100 |  |  | 1,080 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average daily volume weighted-average share price of common stock during term of agreement (in dollars per share) |  |  |  |  | $ 411.66 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
November 2022 ASR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase agreement amount |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase payment |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares received (in shares) |  |  |  | 1,500 |  |  |  | 1,500 |  |  |  |  |  |  |  | 1,800 |  |  |  |  |  |  |  |  |
Increase in treasury stock from share repurchases |  |  |  | $ 850,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in capital in excess of par value |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from capital in excess of par value to treasury stock |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
November 2022 ASR | Mizuho Markets Americas LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |
Shares received (in shares) | 177 |  |  |  |  |  |  | 760 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average daily volume weighted-average share price of common stock during term of agreement (in dollars per share) | $ 533.87 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
November 2022 ASR | Goldman Sachs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |
Shares received (in shares) |  |  | 177 |  |  |  |  | 760 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average daily volume weighted-average share price of common stock during term of agreement (in dollars per share) |  |  | $ 534.16 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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