Subsequent Events	12 Months Ended
Dec. 31, 2013
Subsequent Events
Subsequent Events	Note 27—Subsequent Events Income Taxes—Subsequent to December 31, 2013, we received a draft assessment from the U.S. tax authorities related to our 2010 and 2011 U.S. federal income tax returns. The significant issue raised in the assessment relates to transfer pricing for certain charters of drilling rigs between our subsidiaries. This item, if successfully challenged, would result in net adjustments of approximately $290 million of additional taxes, excluding interest and penalties. An unfavorable outcome on these adjustments could result in a material adverse effect on our consolidated statement of financial position, results of operations or cash flows. Furthermore, if the authorities were to continue to pursue these positions with respect to subsequent years and were successful in such assertions, our effective tax rate on worldwide earnings with respect to years following 2011 could increase substantially, and could have a material adverse effect on our consolidated results of operations and cash flows. We believe our U.S. federal income tax returns are materially correct as filed, and we intend to continue to vigorously defend against all such claims. Discontinued operations—Subsequent to December 31, 2013, in connection with our efforts to discontinue non-strategic operations, we completed the sale of ADTI, which performs drilling management services in the North Sea. Following the completion of the sale transaction, we agreed to provide a $15 million working capital line of credit to the buyer for up to two years. We have also provided a limited guarantee in favor of one customer through expiration of the current drilling project, which is expected to be completed in the fourth quarter of 2014. The disposal of this component of our business results in the discontinuation of our drilling management services operating segment in the year ending December 31, 2014. Debt—Subsequent to December 31, 2013, we repaid borrowings of $163 million outstanding under the ADDCL Credit Facilities. Upon repayment of all borrowings, we terminated the bank credit agreement under which the credit facilities were established.

Note 27—Subsequent Events

Income Taxes—Subsequent to December 31, 2013, we received a draft assessment from the U.S. tax authorities related to our 2010 and 2011 U.S. federal income tax returns. The significant issue raised in the assessment relates to transfer pricing for certain charters of drilling rigs between our subsidiaries. This item, if successfully challenged, would result in net adjustments of approximately $290 million of additional taxes, excluding interest and penalties. An unfavorable outcome on these adjustments could result in a material adverse effect on our consolidated statement of financial position, results of operations or cash flows. Furthermore, if the authorities were to continue to pursue these positions with respect to subsequent years and were successful in such assertions, our effective tax rate on worldwide earnings with respect to years following 2011 could increase substantially, and could have a material adverse effect on our consolidated results of operations and cash flows. We believe our U.S. federal income tax returns are materially correct as filed, and we intend to continue to vigorously defend against all such claims.

Discontinued operations—Subsequent to December 31, 2013, in connection with our efforts to discontinue non-strategic operations, we completed the sale of ADTI, which performs drilling management services in the North Sea. Following the completion of the sale transaction, we agreed to provide a $15 million working capital line of credit to the buyer for up to two years. We have also provided a limited guarantee in favor of one customer through expiration of the current drilling project, which is expected to be completed in the fourth quarter of 2014. The disposal of this component of our business results in the discontinuation of our drilling management services operating segment in the year ending December 31, 2014.

Debt—Subsequent to December 31, 2013, we repaid borrowings of $163 million outstanding under the ADDCL Credit Facilities. Upon repayment of all borrowings, we terminated the bank credit agreement under which the credit facilities were established.