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Pension and Other Postretirement Benefits - Schedule of Obligations and Funded Status (Detail) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 18, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Change in plan assets |  |  |
Employer contributions | $ 50 |  |
Pension benefits |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year |  | $ 7,026 | $ 14,247
Service cost |  | 90 | 165
Interest cost |  | 234 | 435
Amendments |  | 1 | 2
Actuarial (gains) losses |  | 311 | 770
Transfer to Alcoa Corporation |  | 0 | (7,577)
Settlements |  | 0 | (82)
Benefits paid, net of participants’ contributions |  | (425) | (794)
Medicare Part D subsidy receipts |  | 0 | 0
Foreign currency translation impact |  | 122 | (140)
Benefit obligation at end of year |  | 7,359 | 7,026
Change in plan assets |  |  |
Fair value of plan assets at beginning of year |  | 4,666 | 10,928
Actual return on plan assets |  | 212 | 89
Employer contributions |  | 310 | 296
Participants’ contributions |  | 0 | 16
Benefits paid |  | (404) | (762)
Administrative expenses |  | (33) | (65)
Transfer to Alcoa Corporation |  | 0 | (5,610)
Settlements |  | 0 | (82)
Foreign currency translation impact |  | 111 | (144)
Fair value of plan assets at end of year |  | 4,862 | 4,666
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] |  |  |
Funded status |  | (2,497) | (2,360)
Less: Amounts attributed to joint venture partners |  | 0 | 0
Net funded status |  | (2,497) | (2,360)
Amounts recognized in the Consolidated Balance Sheet consist of: |  |  |
Noncurrent assets |  | 89 | 6
Current liabilities |  | (22) | (21)
Noncurrent liabilities |  | (2,564) | (2,345)
Net amount recognized |  | (2,497) | (2,360)
Amounts recognized in Accumulated Other Comprehensive Loss consist of: |  |  |
Net actuarial loss |  | 3,240 | 2,979
Prior service cost (benefit) |  | 10 | 15
Total, before tax effect |  | 3,250 | 2,994
Less: Amounts attributed to joint venture partners |  | 0 | 0
Net amount recognized, before tax effect |  | 3,250 | 2,994
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Loss consist of: |  |  |
Net actuarial loss (gain) |  | 481 | (1,992)
Amortization of accumulated net actuarial loss |  | (220) | (380)
Prior service (benefit) cost |  | 0 | (42)
Amortization of prior service (cost) benefit |  | (5) | (13)
Total, before tax effect |  | 256 | (2,427)
Less: Amounts attributed to joint venture partners |  | 0 | 38
Net amount recognized, before tax effect |  | 256 | (2,389)
Other postretirement benefits |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year |  | 980 | 2,319
Service cost |  | 7 | 13
Interest cost |  | 30 | 63
Amendments |  | 0 | 0
Actuarial (gains) losses |  | 1 | 112
Transfer to Alcoa Corporation |  | 0 | (1,340)
Settlements |  | 0 | 0
Benefits paid, net of participants’ contributions |  | (98) | (197)
Medicare Part D subsidy receipts |  | 7 | 9
Foreign currency translation impact |  | 0 | 1
Benefit obligation at end of year |  | 927 | 980
Change in plan assets |  |  |
Fair value of plan assets at beginning of year |  | 0 | 0
Actual return on plan assets |  | 0 | 0
Employer contributions |  | 0 | 0
Participants’ contributions |  | 0 | 0
Benefits paid |  | 0 | 0
Administrative expenses |  | 0 | 0
Transfer to Alcoa Corporation |  | 0 | 0
Settlements |  | 0 | 0
Foreign currency translation impact |  | 0 | 0
Fair value of plan assets at end of year |  | 0 | 0
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] |  |  |
Funded status |  | (927) | (980)
Less: Amounts attributed to joint venture partners |  | 0 | 0
Net funded status |  | (927) | (980)
Amounts recognized in the Consolidated Balance Sheet consist of: |  |  |
Noncurrent assets |  | 0 | 0
Current liabilities |  | (86) | (91)
Noncurrent liabilities |  | (841) | (889)
Net amount recognized |  | (927) | (980)
Amounts recognized in Accumulated Other Comprehensive Loss consist of: |  |  |
Net actuarial loss |  | 146 | 150
Prior service cost (benefit) |  | (37) | (45)
Total, before tax effect |  | 109 | 105
Less: Amounts attributed to joint venture partners |  | 0 | 0
Net amount recognized, before tax effect |  | 109 | 105
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Loss consist of: |  |  |
Net actuarial loss (gain) |  | 1 | (224)
Amortization of accumulated net actuarial loss |  | (5) | (24)
Prior service (benefit) cost |  | 0 | 37
Amortization of prior service (cost) benefit |  | 8 | 24
Total, before tax effect |  | 4 | (187)
Less: Amounts attributed to joint venture partners |  | 0 | 0
Net amount recognized, before tax effect |  | 4 | (187)
United States | Pension benefits |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year |  | 5,707 |
Benefit obligation at end of year |  | 6,018 | 5,707
Change in plan assets |  |  |
Fair value of plan assets at beginning of year |  | 3,495 |
Fair value of plan assets at end of year |  | 3,544 | 3,495
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] |  |  |
Funded status |  | $ (2,474) | $ (2,212)

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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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=82843861&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)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of (increase) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement. + 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 (a)(10) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. + 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 (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&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 (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&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 (b)(8) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + 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 (j) -URI http://asc.fasb.org/extlink&oid=84228862&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 (i) -URI http://asc.fasb.org/extlink&oid=82843861&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 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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- Definition Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan. + 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 (i) -URI http://asc.fasb.org/extlink&oid=82843861&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 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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- Definition Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit 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-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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- Definition Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 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) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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