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Summary of Activities Related to Restructuring Charges (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]  
Balance as of December 31, 2011 $ 0
Charges 631 [1]
Cash payments (197)
Non-cash items (181) [2]
Balance as of December 31, 2012 253
Severance and Related Restructuring Costs
 
Restructuring Cost and Reserve [Line Items]  
Balance as of December 31, 2011 0
Charges 572 [1]
Cash payments (189)
Non-cash items (145) [2]
Balance as of December 31, 2012 238
Other Restructuring Charges
 
Restructuring Cost and Reserve [Line Items]  
Balance as of December 31, 2011 0
Charges 59 [1]
Cash payments (8)
Non-cash items (36) [2]
Balance as of December 31, 2012 $ 15
[1] Includes restructuring charges related to Home of $55 million.
[2] Non-cash items were primarily related to RSUs, stock options and asset impairments.