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Subsequent Events (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended1 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
6 3/8% Senior Notes due 2011
Redemption of debt
Dec. 31, 2010
6 3/8% Senior Notes due 2011
Redemption of debt
Nov. 01, 2011
Class A common stock
Dividends declared
Nov. 01, 2011
Class B common stock
Dividends declared
Nov. 01, 2011
Dividends declared
Dec. 31, 2011
Sprint Settlement Agreement
Oct. 31, 2011
6 3/8% Senior Notes due 2011
Subsequent Events         
Interest rate (as a percent)6.375%6.375%6.375%6.375%     
Redemption of remaining debt        $ 915
Dividend declared (in dollars per share)    $ 2.00$ 2.00   
Dividend declared      892  
Payment to Sprint to relocate users       $ 114