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Debt and Other Obligations (Debt Purchases and Repayments) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Extinguishment of Debt [Line Items] |  |  |  |
Principal amount |  | $ 1,950 | $ 2,400 | $ 12
Cash paid | [1] | 2,089 | 2,490 | 12
Gains (losses) on retirement of long-term obligations | [2] | (145) | (95) | (2)
Fixed Rate Debt 2009 Securitized Notes A-1 [Member] |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Principal amount |  |  |  | 12
Cash paid | [1] |  |  | 12
Gains (losses) on retirement of long-term obligations | [2] |  |  | (1)
3.400% Senior Notes [Member] |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Principal amount |  |  | 850 |
Cash paid | [1] |  | 863 |
Gains (losses) on retirement of long-term obligations | [2] |  | (13) |
2.250% Senior Notes [Member] |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Principal amount |  |  | 700 |
Cash paid | [1] |  | 714 |
Gains (losses) on retirement of long-term obligations | [2] |  | (16) |
4.875% Senior Notes [Member] |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Principal amount |  |  | 850 |
Cash paid |  |  | 913 |
Gains (losses) on retirement of long-term obligations |  |  | $ (66) |
2016 Term Loan A [Member] |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Principal amount |  | 0 |  | 0
Cash paid | [1] | 0 |  | 0
Gains (losses) on retirement of long-term obligations | [2] | (1) |  | $ (1)
5.250% Senior Notes [Member] |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Principal amount |  | 1,650 |  |
Cash paid | [1] | 1,789 |  |
Gains (losses) on retirement of long-term obligations | [2] | (143) |  |
2015 Tower Revenue Notes 3.222% due 2042 [Member] |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Principal amount |  | 300 |  |
Cash paid | [1] | 300 |  |
Gains (losses) on retirement of long-term obligations | [2] | $ (1) |  |
[1] | Exclusive of accrued interest.
[2] | Inclusive of the write-off of the respective deferred financing costs.

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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12355-112629 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12317-112629 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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