Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Margin Loan) (Details)

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Long-Term Debt (Margin Loan) (Details) - Broadband Holdco, LLC
shares in Millions
Dec. 29, 2017
USD ($)
shares
Common Stock Class C  
Debt Instrument [Line Items]  
Number of shares pledged as collateral | shares 42.7
Value of shares pledged as collateral $ 3,700,000,000
Margin Loan  
Debt Instrument [Line Items]  
Line of credit availability $ 1,000,000,000
Term of debt 2 years
Undrawn commitment fee 1.00%
Margin Loan | LIBOR  
Debt Instrument [Line Items]  
Variable interest rate 1.85%