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Subsequent Events (Details) - USD ($) | Apr. 11, 2019 | Mar. 31, 2019 | Oct. 31, 2017
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Subsequent Event [Line Items] |  |  |
Common Stock, Par or Stated Value Per Share |  | $ 0.10 |
Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Common Stock, Par or Stated Value Per Share | $ 0.40 |  |
Credit Facility due 2019 [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | $ 2,000,000,000
Credit Facility due 2019 [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Line of Credit Facility, Current Borrowing Capacity | $ 2,300,000,000 |  |
Credit Facility due 2020 [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | 1,300,000,000
Credit Facility due 2022 [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | $ 1,200,000,000
Credit Facility due 2022 [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Line of Credit Facility, Current Borrowing Capacity | 1,700,000,000 |  |
Revolving Credit Facility [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 250,000,000 |  |

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=esv_CreditFacilitydue2020Member
Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |