INCOME TAXES - Federal Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of federal income taxes at the applicable statutory rate to the recorded provision from continuing operations
Federal statutory rate (as a percent)	21.00%	21.00%	21.00%
Adjustments:
Federal tax credits (as a percent)	10.60%	1.70%	(684.60%)
Net operating loss carryback (as a percent)	7.50%	1.90%	0.00%
State income taxes, net of federal tax benefit (as a percent)	(4.20%)	4.00%	56.60%
Noncontrolling interest (as a percent)	2.60%	0.70%	(138.90%)
Valuation allowance (as a percent)	(1.50%)	(6.10%)	(237.10%)
Changes in unrecognized tax benefits (as a percent)	(1.00%)	(0.20%)	72.20%
Stock-based compensation (as a percent)	(0.20%)	(0.10%)	(15.90%)
Nondeductible items (as a percent)	(0.10%)	0.00%	192.70%
Effect of consolidated VIEs (as a percent)	0.10%	(0.10%)	46.30%
Spectrum sales (as a percent)	0.00%	0.00%	(386.70%)
Capital loss carryback (as a percent)	0.00%	0.00%	(26.00%)
Other (as a percent)	(0.10%)	0.10%	(3.00%)
Effective income tax rate (as a percent)	34.70%	22.90%	(1103.40%)
Investment tax credits	$ 40	$ 42	$ 57
CARES Act benefit	38	61
Noncontrolling interest	13	23	12
Increase (decrease) in valuation allowance	8	192	16
Change in unrecognized tax benefits	$ 1	$ 5	4
Addition related to regulatory costs, executive compensation and other not tax-deductible expenses			17
Gain from sale of broadcast spectrum			34
Capital loss carryback			$ 2

Effective Income Tax Rate Reconciliation, CARES Act, Amount

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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