Annual report pursuant to Section 13 and 15(d)

Debt (Details 5)

v2.4.1.9
Debt (Details 5) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt, Fair Value $ 990us-gaap_LongTermDebtFairValue $ 1,002us-gaap_LongTermDebtFairValue
Sirius XM 5.875% Senior Notes due 2020    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt, Fair Value 672us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= lmca_SiriusXM5.875SeniorNotesdue2020Member 		 
Sirius XM 5.75% Senior Notes due 2021    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt, Fair Value 619us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= lmca_SiriusXM5.75SeniorNotesdue2021Member 		 
Sirius XM 5.25% Senior Notes due 2022    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt, Fair Value 421us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= lmca_SiriusXm525SeniorNotesDue2022Member 		 
Sirius XM 4.25% Senior Notes due 2020    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt, Fair Value 494us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= lmca_SiriusXM4.25SeniorNotesdue2020Member 		 
Sirius XM 4.625% Senior Notes due 2023    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt, Fair Value 471us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= lmca_SiriusXM4.625SeniorNotesdue2023Member 		 
Sirius XM 6.00% Senior Notes Due 2024 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt, Fair Value $ 1,545us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= lmca_SiriusXM6.00SeniorNotesDue2024Member