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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities      
Net income (loss) $ 1,407,000,000 $ (211,000,000) $ (5,677,000,000)
Adjustments to reconcile to net cash provided by operating activities:      
Amortization of drilling contract intangibles (15,000,000) (42,000,000) (45,000,000)
Depreciation 1,109,000,000 1,123,000,000 1,109,000,000
Depreciation of assets in discontinued operations   183,000,000 342,000,000
Share-based compensation expense 113,000,000 97,000,000 95,000,000
Loss on impairment 81,000,000 140,000,000 5,201,000,000
Loss on impairment of assets in discontinued operations 14,000,000 986,000,000 38,000,000
(Gain) loss on disposal of assets, net (7,000,000) (36,000,000) 12,000,000
Gain on disposal of assets in discontinued operations, net (54,000,000) (82,000,000) (183,000,000)
Amortization of debt issue costs, discounts and premiums, net 6,000,000 68,000,000 125,000,000
Deferred income tax benefit (9,000,000) (133,000,000) (62,000,000)
Other, net 93,000,000 72,000,000 144,000,000
Changes in deferred revenue, net (78,000,000) (54,000,000) (16,000,000)
Changes in deferred expenses, net 74,000,000 85,000,000 (61,000,000)
Changes in operating assets and liabilities (816,000,000) 512,000,000 803,000,000
Net cash provided by operating activities 1,918,000,000 2,708,000,000 1,825,000,000
Cash flows from investing activities      
Capital expenditures (2,238,000,000) (1,303,000,000) (974,000,000)
Capital expenditures for discontinued operations   (106,000,000) (46,000,000)
Investment in business combination, net of cash acquired     (1,246,000,000)
Payment for settlement of forward exchange contract, net     (78,000,000)
Proceeds from disposal of assets, net 174,000,000 191,000,000 14,000,000
Proceeds from disposal of assets in discontinued operations, net 204,000,000 789,000,000 447,000,000
Proceeds from sale of preference shares 185,000,000    
Other, net 17,000,000 40,000,000 (13,000,000)
Net cash used in investing activities (1,658,000,000) (389,000,000) (1,896,000,000)
Cash flows from financing activities      
Changes in short-term borrowings, net   (260,000,000) (88,000,000)
Proceeds from debt   1,493,000,000 2,939,000,000
Repayments of debt (1,692,000,000) (2,282,000,000) (2,409,000,000)
Proceeds from restricted cash investments 298,000,000 311,000,000 479,000,000
Deposits to restricted cash investments (119,000,000) (167,000,000) (523,000,000)
Proceeds from share issuance     1,211,000,000
Distribution of qualifying additional paid-in capital (606,000,000) (276,000,000) (759,000,000)
Financing costs   (24,000,000) (83,000,000)
Other, net (32,000,000) 3,000,000 (33,000,000)
Net cash provided by (used in) financing activities (2,151,000,000) (1,202,000,000) 734,000,000
Net increase (decrease) in cash and cash equivalents (1,891,000,000) 1,117,000,000 663,000,000
Cash and cash equivalents at beginning of period 5,134,000,000 4,017,000,000 3,354,000,000
Cash and cash equivalents at end of period $ 3,243,000,000 $ 5,134,000,000 $ 4,017,000,000