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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Assets    
Cash and cash equivalents $ 2,682us-gaap_CashAndCashEquivalentsAtCarryingValue $ 2,635us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net of allowance for doubtful accounts of $14 at March 31, 2015 and December 31, 2014 1,964us-gaap_ReceivablesNetCurrent 2,120us-gaap_ReceivablesNetCurrent
Materials and supplies, net of allowance for obsolescence of $112 and $109 at March 31, 2015 and December 31, 2014, respectively 807us-gaap_Supplies 818us-gaap_Supplies
Assets held for sale 23us-gaap_AssetsHeldForSaleCurrent 25us-gaap_AssetsHeldForSaleCurrent
Deferred income taxes, net 157us-gaap_DeferredTaxAssetsNetCurrent 161us-gaap_DeferredTaxAssetsNetCurrent
Other current assets 210us-gaap_OtherAssetsCurrent 242us-gaap_OtherAssetsCurrent
Total current assets 5,843us-gaap_AssetsCurrent 6,001us-gaap_AssetsCurrent
Property and equipment 26,740us-gaap_PropertyPlantAndEquipmentGross 28,516us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation (6,174)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (6,978)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 20,566us-gaap_PropertyPlantAndEquipmentNet 21,538us-gaap_PropertyPlantAndEquipmentNet
Other assets 696us-gaap_OtherAssetsNoncurrent 874us-gaap_OtherAssetsNoncurrent
Total assets 27,105us-gaap_Assets 28,413us-gaap_Assets
Liabilities and equity    
Accounts payable 619us-gaap_AccountsPayableCurrent 784us-gaap_AccountsPayableCurrent
Accrued income taxes 217us-gaap_AccruedIncomeTaxesCurrent 131us-gaap_AccruedIncomeTaxesCurrent
Debt due within one year 1,024us-gaap_DebtCurrent 1,033us-gaap_DebtCurrent
Other current liabilities 1,313us-gaap_OtherLiabilitiesCurrent 1,822us-gaap_OtherLiabilitiesCurrent
Total current liabilities 3,173us-gaap_LiabilitiesCurrent 3,770us-gaap_LiabilitiesCurrent
Long-term debt 8,996us-gaap_LongTermDebtNoncurrent 9,059us-gaap_LongTermDebtNoncurrent
Deferred income taxes, net 152us-gaap_DeferredTaxLiabilitiesNoncurrent 237us-gaap_DeferredTaxLiabilitiesNoncurrent
Other long-term liabilities 1,263us-gaap_OtherLiabilitiesNoncurrent 1,354us-gaap_OtherLiabilitiesNoncurrent
Total long-term liabilities 10,411us-gaap_LiabilitiesNoncurrent 10,650us-gaap_LiabilitiesNoncurrent
Commitments and contingencies      
Redeemable noncontrolling interest 11us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount 11us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount
Shares, CHF 15.00 par value, 396,260,487 authorized, 167,617,649 conditionally authorized, 373,830,649 issued at March 31, 2015 and December 31, 2014 and 363,346,369 and 362,279,530 outstanding at March 31, 2015 and December 31, 2014, respectively 5,183us-gaap_CommonStockValue 5,169us-gaap_CommonStockValue
Additional paid-in capital 5,806us-gaap_AdditionalPaidInCapital 5,797us-gaap_AdditionalPaidInCapital
Treasury shares, at cost, 2,863,267 held at March 31, 2015 and December 31, 2014 (240)us-gaap_TreasuryStockValue (240)us-gaap_TreasuryStockValue
Retained earnings 2,866us-gaap_RetainedEarningsAccumulatedDeficit 3,349us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (414)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (404)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total controlling interest shareholders' equity 13,201us-gaap_StockholdersEquity 13,671us-gaap_StockholdersEquity
Noncontrolling interest 309us-gaap_MinorityInterest 311us-gaap_MinorityInterest
Total equity 13,510us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 13,982us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and equity $ 27,105us-gaap_LiabilitiesAndStockholdersEquity $ 28,413us-gaap_LiabilitiesAndStockholdersEquity