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Other Financial Data (Accrued Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accrued Liabilities [Abstract]    
Deferred revenue $ 820 $ 774
Compensation 424 471
Billings in excess of costs and earnings 387 250
Tax liabilities 95 126
Customer reserves 144 125
Networks purchase price adjustment 0 96
Dividend payable 72 70
Other 684 821
Accrued liabilities $ 2,626 $ 2,733