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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities        
Net income $ 597 $ 311 $ 1,063 $ 624
Adjustments to reconcile to net cash provided by operating activities        
Amortization of drilling contract intangibles (4) (7) (8) (16)
Depreciation 288 286 561 561
Share-based compensation expense 23 28 51 49
Loss on impairment   37 65 37
(Gain) loss on disposal of assets, net (1) 2 2 9
(Gain) loss on disposal of assets in discontinued operations, net   (3) 10 (18)
Deferred income taxes (25) (8) (40) (36)
Other, net 5 35 17 50
Changes in deferred revenue, net 96 (29) 70 (35)
Changes in deferred costs, net (18) (9) 20 8
Changes in operating assets and liabilities (325) (227) (1,039) (711)
Net cash provided by operating activities 636 416 772 522
Cash flows from investing activities        
Capital expenditures (351) (352) (1,482) (840)
Proceeds from disposal of assets, net 10 3 101 4
Proceeds from disposal of assets in discontinued operations, net 22   36 63
Proceeds from repayment of notes receivable 98 3 101 11
Proceeds from sale of preference shares   185   185
Other, net     (15) 1
Net cash used in investing activities (221) (161) (1,259) (576)
Cash flows from financing activities        
Repayments of debt (6) (406) (243) (1,596)
Proceeds from restricted cash investments   78 107 206
Deposits to restricted cash investments   (45) (20) (104)
Distribution of qualifying additional paid-in capital (272) (202) (474) (202)
Other, net (7) (12) (9) (27)
Net cash used in financing activities (285) (587) (639) (1,723)
Net increase (decrease) in cash and cash equivalents 130 (332) (1,126) (1,777)
Cash and cash equivalents at beginning of period 1,987 3,689 3,243 5,134
Cash and cash equivalents at end of period $ 2,117 $ 3,357 $ 2,117 $ 3,357