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Financial Instruments and Risk Management - General (Details) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) item $ / shares shares | Dec. 31, 2018 USD ($) | Dec. 31, 2016 USD ($)
Financial Instruments and Risk Management |  |  |
Aggregate fair value of derivative instruments with credit-risk-related contingent features that were in a net liability position | $ 35 | $ 46 |
Collateral amount posted for derivative instruments with credit-risk-related contingent features that were in a net liability position | $ 0 | $ 0 |
Cash Flow Hedging |  |  |
Financial Instruments and Risk Management |  |  |
Period within which derivative will expire | 2 years |  |
Commodity contracts |  |  |
Financial Instruments and Risk Management |  |  |
Number of methods through which entity manages commodity price risk in connection with market price fluctuations of aluminum ingot | item | 2 |  |
Notional amount of derivatives | $ 1,700 |  |
Net gain (loss) expected to be recognized in the consolidated statement of earnings during the next 12 months | (13) |  |
Gain (loss) on derivatives included in AOCI, net of tax | (15) |  |
Commodity contracts | Derivatives Designated As Hedging Instruments | Cash Flow Hedging |  |  |
Financial Instruments and Risk Management |  |  |
Notional amount of derivatives | 1,600 |  |
Interest rate swap and option contracts |  |  |
Financial Instruments and Risk Management |  |  |
Notional amount of derivatives | $ 827,000 |  |
Period within which derivative will expire | 2 years |  |
Currency Exchange Rate Risk | Cash Flow Hedging |  |  |
Financial Instruments and Risk Management |  |  |
Notional amount of derivatives | $ 4,300 |  |
Period within which derivative will expire | 5 years |  |
Net gain (loss) expected to be recognized in the consolidated statement of earnings during the next 12 months | $ (1) |  |
Gain (loss) on derivatives included in AOCI, net of tax | 7 |  |
Cross-currency swap |  |  |
Financial Instruments and Risk Management |  |  |
Notional amount of derivatives |  |  | $ 1,000
Net gain (loss) expected to be recognized in the consolidated statement of earnings during the next 12 months | $ (4) |  |
Equity contracts |  |  |
Financial Instruments and Risk Management |  |  |
Change in company's stock price (in dollars per share) | $ / shares | $ 1 |  |
Combined notional value (in shares) | shares | 2.9 |  |

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- Definition Amount, after tax, of accumulated gain (loss) on derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 + Details
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