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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2014
CHF
Jun. 30, 2014
Current Assets:        
Allowance for Uncollectible Accounts $ 111us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 108us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent    
Noncurrent Assets:        
Accumulated Depreciation of Property, Plant and Equipment 6,976us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 6,895us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment    
Accumulated Amortization of Other Intangible Assets $ 746us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization $ 744us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization    
Shareholders’ Equity:        
Common Shares, Par Value (in USD and CHF per share, respectively) $ 0.001us-gaap_CommonStockParOrStatedValuePerShare   0.001us-gaap_CommonStockParOrStatedValuePerShare  
Common Shares, Authorized (in shares) 1,356,000,000us-gaap_CommonStockSharesAuthorized 1,356,000,000us-gaap_CommonStockSharesAuthorized 1,356,000,000us-gaap_CommonStockSharesAuthorized  
Common Shares, Conditionally Authorized (in shares)   0wft_CommonSharesSharesConditionallyAuthorized 0wft_CommonSharesSharesConditionallyAuthorized  
Common Shares, Issued (in shares) 774,000,000us-gaap_CommonStockSharesIssued 774,000,000us-gaap_CommonStockSharesIssued 774,000,000us-gaap_CommonStockSharesIssued  
Common Stock, Outstanding (in shares) 774,000,000us-gaap_CommonStockSharesOutstanding 774,000,000us-gaap_CommonStockSharesOutstanding 774,000,000us-gaap_CommonStockSharesOutstanding 774,000,000us-gaap_CommonStockSharesOutstanding
Treasury Shares, at cost (in shares) 0us-gaap_TreasuryStockShares 0us-gaap_TreasuryStockShares 0us-gaap_TreasuryStockShares