v2.4.0.6
Acquired Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life Remaining 5 years 1 month 6 days [1]  
Acquired Intangibles, Gross $ 1,162 [1],[2] $ 977 [1],[2]
Accumulated Amortization (437) [1],[2] (330) [1],[2]
Acquired Intangibles, Net 725 [1] 647 [1]
Marketing-related
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life Remaining 7 years 3 months 18 days  
Acquired Intangibles, Gross 422 [2] 408 [2]
Accumulated Amortization (113) [2] (74) [2]
Acquired Intangibles, Net 309 334
Contract-based
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life Remaining 3 years 10 months 24 days  
Acquired Intangibles, Gross 177 [2] 189 [2]
Accumulated Amortization (89) [2] (74) [2]
Acquired Intangibles, Net 88 115
Technology and content- based
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life Remaining 4 years 10 months 24 days  
Acquired Intangibles, Gross 231 [2] 37 [2]
Accumulated Amortization (30) [2] (13) [2]
Acquired Intangibles, Net 201 24
Customer-related
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life Remaining 3 years 2 months 12 days  
Acquired Intangibles, Gross 332 [2] 343 [2]
Accumulated Amortization (205) [2] (169) [2]
Acquired Intangibles, Net $ 127 $ 174
[1] Intangible assets have estimated useful lives of between one and 10 years.
[2] Excludes the original cost and accumulated amortization of fully-amortized intangibles.