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Postemployment Benefit Plans (Costs) (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 plan | Sep. 30, 2014 plan | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Net periodic benefit costs, before tax |  |  |  |  |
Service cost |  |  | $ 13 | $ 32 |
Interest cost |  |  | 87 | 86 |
Net periodic benefit costs |  |  | 11 | 26 | $ 75
Unrecognized accumulated other comprehensive income, before tax |  |  |  |  |
Actuarial loss, net |  |  | (413) | (406) |
Prior service cost, net |  |  | 26 | 31 |
Total |  |  | (387) | (375) |
Accumulated other comprehensive income expected to be recognized during the next fiscal year |  |  |  |  |
Actuarial loss, net |  |  | 6 |  |
Prior service cost, net |  |  | (3) |  |
Total amount expected to be recognized |  |  | 3 |  |
Transocean Plans |  |  |  |  |
Net periodic benefit costs, before tax |  |  |  |  |
Service cost |  |  | 13 | 31 | 68
Interest cost |  |  | 86 | 84 | 91
Expected return on plan assets |  |  | (105) | (115) | (103)
Settlements and curtailments |  |  | (5) | 5 | (4)
Actuarial (gain) loss, net |  |  | 4 | 22 | 22
Prior service cost, net |  |  |  |  | (1)
Net periodic benefit costs |  |  | (7) | 27 | 73
U.S. Plans |  |  |  |  |
Net periodic benefit costs, before tax |  |  |  |  |
Service cost |  |  | 3 | 5 | 39
Interest cost |  |  | 69 | 65 | 64
Expected return on plan assets |  |  | (80) | (87) | (75)
Settlements and curtailments |  |  |  | 3 | (7)
Actuarial (gain) loss, net |  |  | 5 | 11 | 17
Prior service cost, net |  |  |  |  | (1)
Net periodic benefit costs |  |  | (3) | (3) | 37
Unrecognized accumulated other comprehensive income, before tax |  |  |  |  |
Actuarial loss, net |  |  | (316) | (281) |
Total |  |  | (316) | (281) |
Accumulated other comprehensive income expected to be recognized during the next fiscal year |  |  |  |  |
Actuarial loss, net |  |  | 5 |  |
Total amount expected to be recognized |  |  | 5 |  |
Non-U.S. Plans |  |  |  |  |
Net periodic benefit costs, before tax |  |  |  |  |
Service cost |  |  | 10 | 26 | 29
Interest cost |  |  | 17 | 19 | 27
Expected return on plan assets |  |  | (25) | (28) | (28)
Settlements and curtailments |  |  | (5) | 2 | 3
Actuarial (gain) loss, net |  |  | (1) | 11 | 5
Net periodic benefit costs |  |  | (4) | 30 | 36
Number of unfunded defined plans that recognized settlement and curtailment charges | plan | 2 | 2 |  |  |
Unrecognized accumulated other comprehensive income, before tax |  |  |  |  |
Actuarial loss, net |  |  | (94) | (119) |
Total |  |  | (94) | (119) |
Accumulated other comprehensive income expected to be recognized during the next fiscal year |  |  |  |  |
Actuarial loss, net |  |  | 1 |  |
Total amount expected to be recognized |  |  | 1 |  |
OPEB Plans |  |  |  |  |
Net periodic benefit costs, before tax |  |  |  |  |
Service cost |  |  |  | 1 |
Interest cost |  |  | 1 | 2 |
Net periodic benefit costs |  |  | (4) | (1) | $ 2
Unrecognized accumulated other comprehensive income, before tax |  |  |  |  |
Actuarial loss, net |  |  | (3) | (6) |
Prior service cost, net |  |  | 26 | 31 |
Total |  |  | 23 | $ 25 |
Accumulated other comprehensive income expected to be recognized during the next fiscal year |  |  |  |  |
Prior service cost, net |  |  | (3) |  |
Total amount expected to be recognized |  |  | $ (3) |  |

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- Definition The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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- Definition The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation). + References No definition available. + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of net gain (loss) recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements result from an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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