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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Impact from Adoption to Shareholder's Equity (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Total shareholders’ equity | $ 22,669 | $ 20,439 | $ 19,784 | $ 20,140 | $ 19,946 | $ 19,558 | $ 17,560 | $ 17,031 |  | $ 33,559
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Total shareholders’ equity | 136 | 136 | 135 | 135 | 135 | 135 | 135 | 135 |  | 135
Additional Paid-in Capital |  |  |  |  |  |  |  |  |  |
Total shareholders’ equity | 2,729 | 2,697 | 2,665 | 2,641 | 2,615 | 2,589 | 2,560 | 2,529 |  | 2,410
Retained Earnings |  |  |  |  |  |  |  |  |  |
Total shareholders’ equity | 48,257 | 46,937 | 45,555 | 44,367 | 44,680 | 43,150 | 42,010 | 40,963 |  | 37,984
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |
Total shareholders’ equity | (5,760) | (7,338) | (7,278) | (6,429) | (7,505) | (6,980) | (8,451) | (8,411) |  | 8,934
Treasury Stock |  |  |  |  |  |  |  |  |  |
Total shareholders’ equity | $ (22,693) | $ (21,993) | $ (21,293) | $ (20,574) | $ (19,979) | $ (19,336) | $ (18,694) | $ (18,185) |  | $ (15,904)
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |
Total shareholders’ equity |  |  |  |  |  |  |  |  | $ (18,894) |
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Total shareholders’ equity |  |  |  |  |  |  |  |  | 0 |
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Additional Paid-in Capital |  |  |  |  |  |  |  |  |  |
Total shareholders’ equity |  |  |  |  |  |  |  |  | 0 |
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |  |  |  |  |  |  |
Total shareholders’ equity |  |  |  |  |  |  |  |  | (324) |
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |
Total shareholders’ equity |  |  |  |  |  |  |  |  | (18,570) |
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Treasury Stock |  |  |  |  |  |  |  |  |  |
Total shareholders’ equity |  |  |  |  |  |  |  |  | 0 |
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |  |  |
Total shareholders’ equity |  |  |  |  |  |  |  |  | 14,665 |
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Total shareholders’ equity |  |  |  |  |  |  |  |  | 135 |
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Additional Paid-in Capital |  |  |  |  |  |  |  |  |  |
Total shareholders’ equity |  |  |  |  |  |  |  |  | 2,410 |
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Retained Earnings |  |  |  |  |  |  |  |  |  |
Total shareholders’ equity |  |  |  |  |  |  |  |  | 37,660 |
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |
Total shareholders’ equity |  |  |  |  |  |  |  |  | (9,636) |
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Treasury Stock |  |  |  |  |  |  |  |  |  |
Total shareholders’ equity |  |  |  |  |  |  |  |  | $ (15,904) |

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