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)