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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019 | Jan. 01, 2018 | Jan. 01, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | $ 5,585 | $ 4,924 | $ 5,141 |  |  |
Adoption of accounting standard (A) |  |  |  | $ 73 | $ 0 | $ 0
Total Other comprehensive (loss) income, net of tax | (401) | 85 | (74) |  |  |
Balance at end of period | 4,621 | 5,585 | 4,924 |  |  |
Arconic |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | (2,926) | (2,644) | (2,568) |  |  |
Adoption of accounting standard (A) |  |  |  | (2) | (367) |
Total Other comprehensive (loss) income, net of tax | (401) | 85 | (76) |  |  |
Balance at end of period | (3,329) | (2,926) | (2,644) |  |  |
Pension and other postretirement benefits (F) |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | (2,344) | (2,230) | (2,010) |  |  |
Unrecognized net actuarial gain and prior service cost/benefit | (587) | 70 | (466) |  |  |
Tax benefit (expense) | 129 | (19) | 102 |  |  |
Total Other comprehensive (loss) income before reclassifications, net of tax | (458) | 51 | (364) |  |  |
Amortization of net actuarial loss and prior service cost | 90 | 262 | 222 |  |  |
Tax expense | (20) | (58) | (78) |  |  |
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 70 | 204 | 144 |  |  |
Total Other comprehensive (loss) income, net of tax | (388) | 255 | (220) |  |  |
Balance at end of period | (2,732) | (2,344) | (2,230) |  |  |
Foreign currency translation |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | (583) | (437) | (689) |  |  |
Total Other comprehensive (loss) income, net of tax | (13) | (146) | 252 |  |  |
Balance at end of period | (596) | (583) | (437) |  |  |
Debt securities |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | (3) | (2) | 132 |  |  |
Total Other comprehensive (loss) income, net of tax | 3 | (1) | (134) |  |  |
Balance at end of period | 0 | (3) | (2) |  |  |
Cash flow hedges |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | 4 | 25 | (1) |  |  |
Unrecognized net actuarial gain and prior service cost/benefit | (9) | (15) | 37 |  |  |
Tax benefit (expense) | 3 | 3 | (9) |  |  |
Total Other comprehensive (loss) income before reclassifications, net of tax | (6) | (12) | 28 |  |  |
Amortization of net actuarial loss and prior service cost | 4 | (14) | (3) |  |  |
Tax expense | (1) | 3 | 1 |  |  |
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 3 | (11) | (2) |  |  |
Total Other comprehensive (loss) income, net of tax | (3) | (23) | 26 |  |  |
Balance at end of period | (1) | 4 | 25 |  |  |
Cash flow hedges | Aluminum Contracts |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Amortization of net actuarial loss and prior service cost | 5 | (8) | (2) |  |  |
Cash flow hedges | Interest Rate Contracts |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Amortization of net actuarial loss and prior service cost | 0 | (2) | 0 |  |  |
Cash flow hedges | Nickel Contracts |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Amortization of net actuarial loss and prior service cost | (1) | (4) | (1) |  |  |
Noncontrolling Interests |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | 0 | 0 |  |  |  |
Balance at end of period | 0 | 0 | 0 |  |  |
Pension and other postretirement benefits (F) |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | 0 | 0 | 0 |  |  |
Unrecognized net actuarial gain and prior service cost/benefit | 0 | 0 | 0 |  |  |
Tax benefit (expense) | 0 | 0 | 0 |  |  |
Total Other comprehensive (loss) income before reclassifications, net of tax | 0 | 0 | 0 |  |  |
Amortization of net actuarial loss and prior service cost | 0 | 0 | 0 |  |  |
Tax expense | 0 | 0 | 0 |  |  |
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 0 | 0 | 0 |  |  |
Total Other comprehensive (loss) income, net of tax | 0 | 0 | 0 |  |  |
Balance at end of period | 0 | 0 | 0 |  |  |
Foreign currency translation |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | 0 | 0 | (2) |  |  |
Total Other comprehensive (loss) income, net of tax | 0 | 0 | 2 |  |  |
Balance at end of period | 0 | 0 | 0 |  |  |
Debt securities |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | 0 | 0 | 0 |  |  |
Total Other comprehensive (loss) income, net of tax | 0 | 0 | 0 |  |  |
Balance at end of period | 0 | 0 | 0 |  |  |
Cash flow hedges |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | 0 | 0 | 0 |  |  |
Unrecognized net actuarial gain and prior service cost/benefit | 0 | 0 | 0 |  |  |
Tax benefit (expense) | 0 | 0 | 0 |  |  |
Total Other comprehensive (loss) income before reclassifications, net of tax | 0 | 0 | 0 |  |  |
Amortization of net actuarial loss and prior service cost | 0 | 0 | 0 |  |  |
Tax expense | 0 | 0 | 0 |  |  |
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 0 | 0 | 0 |  |  |
Total Other comprehensive (loss) income, net of tax | 0 | 0 | 0 |  |  |
Balance at end of period | 0 | 0 | 0 |  |  |
Cash flow hedges | Aluminum Contracts |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Amortization of net actuarial loss and prior service cost | 0 | 0 | 0 |  |  |
Cash flow hedges | Interest Rate Contracts |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Amortization of net actuarial loss and prior service cost | 0 | 0 | 0 |  |  |
Cash flow hedges | Nickel Contracts |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Amortization of net actuarial loss and prior service cost | $ 0 | $ 0 | $ 0 |  |  |
ASU 2017-07 | Pension and other postretirement benefits (F) |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Adoption of accounting standard (A) |  |  |  | 0 | (369) | 0
ASU 2017-07 | Pension and other postretirement benefits (F) |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Adoption of accounting standard (A) |  |  |  | 0 | 0 | $ 0
ASU 2017-12 |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Adoption of accounting standard (A) |  |  |  | 2 |  |
ASU 2017-12 | Cash flow hedges |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Adoption of accounting standard (A) |  |  |  | (2) | 2 |
ASU 2017-12 | Cash flow hedges |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Adoption of accounting standard (A) |  |  |  | $ 0 | $ 0 |

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