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Significant Accounting Policies (Impair and Pensions) (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) item $ / shares | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) $ / shares
Long-Live assets |  |  |  |  |  |
Loss associated with impairment | $ 52 | $ 668 | $ 507 |  |  |
Goodwill |  |  |  |  |  |
Goodwill impairment loss |  |  |  |  |  | $ 3,000
Loss on impairment of goodwill, tax effect |  |  |  |  |  | 0
Loss on impairment of goodwill attributable to controlling interest |  |  |  |  |  | $ 2,900
Loss on impairment of goodwill per diluted share from continuing operations | $ / shares |  |  |  |  |  | $ 8.02
Loss on impairment of goodwill attributable to noncontrolling interest |  |  |  |  |  | $ 74
Pension and other postretirement benefits |  |  |  |  |  |
Recognition period of investment gains or losses related to asset valuation for determining net periodic benefit cost |  |  |  | 5 years |  |
Conditional amortization gains or losses as percentage of greater of plan assets or liabilities, minimum |  |  |  | 10.00% |  |
Number of critical fair value assumptions | item |  |  |  | 2 |  |
Pension liability, current and noncurrent | 375 |  |  | $ 375 | $ 414 |
Pension asset, non-current | $ 5 |  |  | 5 | 2 |
Net periodic benefit costs |  |  |  | 11 | 26 | 75
Construction in Progress |  |  |  |  |  |
Long-Live assets |  |  |  |  |  |
Loss associated with impairment |  |  |  |  | 52 |
Deepwater Floater asset group |  |  |  |  |  |
Long-Live assets |  |  |  |  |  |
Loss associated with impairment |  |  |  | $ 52 | 507 | 788
Loss associated with impairment, net of tax |  |  |  |  | $ 481 | $ 693
Loss associated with impairment per diluted share | $ / shares |  |  |  | $ 0.14 | $ 1.31 | $ 1.91
Midwater Floater asset group |  |  |  |  |  |
Long-Live assets |  |  |  |  |  |
Loss associated with impairment |  |  |  |  | $ 668 |
Loss associated with impairment, net of tax |  |  |  |  | $ 654 |
Loss associated with impairment per diluted share | $ / shares |  |  |  |  | $ 1.78 |

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