XML 99 R49.htm IDEA: XBRL DOCUMENT v2.4.1.9
Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
item
Dec. 31, 2013
Dec. 31, 2012
Significant Accounting Policies      
Number of countries in which the entity operates 21oi_OperationsCountriesInNumber    
Stock-Based Compensation      
Compensation cost recognized for equity instruments for which employees do not render the required service $ 21us-gaap_AllocatedShareBasedCompensationExpense $ 11us-gaap_AllocatedShareBasedCompensationExpense $ 11us-gaap_AllocatedShareBasedCompensationExpense
Maximum      
Equity Method Investments      
General ownership percentage for equity method investments 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Minimum      
Equity Method Investments      
General ownership percentage for equity method investments 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember