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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Changes in Accounting Policies (Details) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative adjustment, increase to opening balance of retained earnings	$ 6,252		$ 6,091	$ 5,456
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative adjustment, increase to opening balance of retained earnings	$ 13,735	$ 12,864	12,244	$ 11,159	$ 10,480	$ 10,134
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative adjustment, increase to opening balance of retained earnings		$ 0	121		$ 0	$ (3)
Accounting Standards Update 2019-12 | Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative adjustment, increase to opening balance of retained earnings			$ 121

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