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Debt and Other Obligations (Scheduled Contractual Maturities) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Contractual Maturities - Year 1	$ 338	[1]
Contractual Maturities - Year 2	1,841
Contractual Maturities - Year 3	844
Contractual Maturities - Year 4	637
Contractual Maturities - Year 5	1,659
Contractual Maturities - Thereafter	15,478
Total Cash Obligations	20,797
Total Debt and Other Obligations Outstanding	20,629
Unamortized Discounts	$ (168)
Tower Revenue Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Increase (Decrease)	5.00%
Debt, interest rate increase if not paid by anticipated repayment date	5.00%
[1] Predominately consists of outstanding indebtedness under the CP Program. Such amounts may be issued, repaid or re-issued from time to time

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