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Long-Term Debt (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020 | Jul. 01, 2019 | Dec. 31, 2018
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Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Lower Range of Basis Spread on Variable Rate | 0.25% |  |  |
Debt Instrument, Higher Range of Basis Spread on Variable Rate | 0.75% |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | $ 2,810 |  |  |
Derivative, Notional Amount |  |  | $ 125 |
Derivative Liability, Current | $ 2 |  |  |
Derivative Liability, Noncurrent |  | $ 3 |  |
Debt, Weighted Average Interest Rate | 4.90% |  |  |
Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 2,950
Line of Credit Facility, Standby Letter of Credit |  |  |  | 450
Line of credit facility, uncommitted loan |  |  |  | 1,500
Tranche One, Shared with Related Party | Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 400 |  |  | 400
Tranche One, Shared with Related Party | Standby Letters of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Standby Letter of Credit |  |  |  | 50
QVC | Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 2,550
London Interbank Offered Rate (LIBOR) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Lower Range of Basis Spread on Variable Rate | 1.25% |  |  |
Debt Instrument, Higher Range of Basis Spread on Variable Rate | 1.75% |  |  |
6.375% Senior Secured Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.375% |  |  |
6.25% Senior Secured Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.25% |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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