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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities        
Net income (loss) $ 311 $ (303) $ 624 $ (285)
Adjustments to reconcile to net cash provided by operating activities        
Amortization of drilling contract intangibles (7) (12) (16) (23)
Depreciation 286 280 561 565
Depreciation and amortization of assets in discontinued operations   65   135
Share-based compensation expense 28 25 49 48
Loss on impairment 37   37 140
Loss on impairment of assets in discontinued operations   12   105
Loss on disposal of assets, net 2 7 9 10
Gain on disposal of assets in discontinued operations, net (3) (72) (18) (71)
Amortization of debt issue costs, discounts and premiums, net 2 17 2 35
Deferred income taxes (8) (26) (36) (43)
Other, net 33 20 48 35
Changes in deferred revenue, net (29) 7 (35) (5)
Changes in deferred expenses, net (9) 28 8 (21)
Changes in operating assets and liabilities (227) 411 (711) 374
Net cash provided by operating activities 416 459 522 999
Cash flows from investing activities        
Capital expenditures (352) (207) (840) (445)
Capital expenditures for discontinued operations   (29)   (51)
Proceeds from disposal of assets, net 3 1 4 8
Proceeds from disposal of assets in discontinued operations, net   160 63 194
Cash proceeds received from the sale of preference shares 185   185  
Other, net 3 13 12 25
Net cash used in investing activities (161) (62) (576) (269)
Cash flows from financing activities        
Changes in short-term borrowings, net   (260)   (260)
Repayments of debt (406) (173) (1,596) (320)
Proceeds from restricted cash investments 78 84 206 192
Deposits to restricted cash investments (45) (74) (104) (116)
Distribution of qualifying additional paid-in capital (204)   (204) (278)
Other, net (10) 8 (25) (1)
Net cash used in financing activities (587) (415) (1,723) (783)
Net decrease in cash and cash equivalents (332) (18) (1,777) (53)
Cash and cash equivalents at beginning of period 3,689 3,982 5,134 4,017
Cash and cash equivalents at end of period $ 3,357 $ 3,964 $ 3,357 $ 3,964