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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) In Millions, except Share data, unless otherwise specified	Mar. 31, 2015 USD ($)	Mar. 31, 2015 CHF	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CHF
CONDENSED CONSOLIDATED BALANCE SHEETS
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 14us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent		$ 14us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Materials and supplies, allowance for obsolescence (in dollars)	$ 112us-gaap_InventoryValuationReserves		$ 109us-gaap_InventoryValuationReserves
Shares, CHF par value (in Swiss francs per share)		15.00us-gaap_CommonStockParOrStatedValuePerShare		15.00us-gaap_CommonStockParOrStatedValuePerShare
Shares, authorized	396,260,487us-gaap_CommonStockSharesAuthorized	396,260,487us-gaap_CommonStockSharesAuthorized	396,260,487us-gaap_CommonStockSharesAuthorized	396,260,487us-gaap_CommonStockSharesAuthorized
Shares, conditionally authorized	167,617,649rig_SharesConditionallyAuthorized	167,617,649rig_SharesConditionallyAuthorized
Shares, issued	373,830,649us-gaap_CommonStockSharesIssued	373,830,649us-gaap_CommonStockSharesIssued	373,830,649us-gaap_CommonStockSharesIssued	373,830,649us-gaap_CommonStockSharesIssued
Shares, outstanding	363,346,369us-gaap_CommonStockSharesOutstanding	363,346,369us-gaap_CommonStockSharesOutstanding	362,279,530us-gaap_CommonStockSharesOutstanding	362,279,530us-gaap_CommonStockSharesOutstanding
Treasury shares	2,863,267us-gaap_TreasuryStockShares	2,863,267us-gaap_TreasuryStockShares	2,863,267us-gaap_TreasuryStockShares	2,863,267us-gaap_TreasuryStockShares

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Conditional capital represents the amount of additional registered shares that the board is authorized to issue without obtaining additional shareholder approval.

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Amount of valuation reserve for inventory.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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