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Employee Benefit Obligations - Asset Categories (Details) | Dec. 31, 2019 | Dec. 31, 2018
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U.K. | Minimum | Cash and cash equivalents |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 60.00% |
U.K. | Minimum | Fixed income securities |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 60.00% |
U.K. | Minimum | Equity securities |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 0.00% |
U.K. | Minimum | Alternative investments |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 0.00% |
U.K. | Maximum | Cash and cash equivalents |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 100.00% |
U.K. | Maximum | Fixed income securities |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 100.00% |
U.K. | Maximum | Equity securities |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 20.00% |
U.K. | Maximum | Alternative investments |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 20.00% |
Defined Benefit Pension Plans |  |
Target asset allocations |  |
Weighted average asset allocations (as a percent) | 100.00% | 100.00%
Defined Benefit Pension Plans | Cash and cash equivalents |  |
Target asset allocations |  |
Weighted average asset allocations (as a percent) | 2.00% | 2.00%
Defined Benefit Pension Plans | Fixed income securities |  |
Target asset allocations |  |
Weighted average asset allocations (as a percent) | 79.00% | 69.00%
Defined Benefit Pension Plans | Equity securities |  |
Target asset allocations |  |
Weighted average asset allocations (as a percent) | 17.00% | 28.00%
Defined Benefit Pension Plans | Alternative investments |  |
Target asset allocations |  |
Weighted average asset allocations (as a percent) | 2.00% | 1.00%
Defined Benefit Pension Plans | U.K. | Minimum | Fixed Income Securities And Cash And Cash Equivalents Combined |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 60.00% |
Defined Benefit Pension Plans | U.K. | Maximum | Fixed Income Securities And Cash And Cash Equivalents Combined |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 100.00% |
Legacy Ball | US Plan | Minimum | Cash and cash equivalents |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 0.00% |
Legacy Ball | US Plan | Minimum | Fixed income securities |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 25.00% |
Legacy Ball | US Plan | Minimum | Equity securities |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 10.00% |
Legacy Ball | US Plan | Minimum | Alternative investments |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 0.00% |
Legacy Ball | US Plan | Maximum | Cash and cash equivalents |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 10.00% |
Legacy Ball | US Plan | Maximum | Fixed income securities |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 70.00% |
Legacy Ball | US Plan | Maximum | Equity securities |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 75.00% |
Legacy Ball | US Plan | Maximum | Alternative investments |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 35.00% |
Legacy Ball | Defined Benefit Pension Plans | US Plan | Maximum | Large-cap equities |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 25.00% |
Legacy Ball | Defined Benefit Pension Plans | US Plan | Maximum | Mid-cap equities |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 10.00% |
Legacy Ball | Defined Benefit Pension Plans | US Plan | Maximum | Small-cap equities |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 10.00% |
Legacy Ball | Defined Benefit Pension Plans | US Plan | Maximum | Foreign equities |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 35.00% |
Legacy Ball | Defined Benefit Pension Plans | US Plan | Maximum | Special equities |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 35.00% |
Legacy Ball | Defined Benefit Pension Plans | US Plan | Maximum | Holdings in Ball Corporation common stock or Ball bonds |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 5.00% |
Legacy Ball | Defined Benefit Pension Plans | US Plan | Maximum | Non-investment grade bonds |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 10.00% |
Legacy Ball | Defined Benefit Pension Plans | US Plan | Maximum | Bank loans |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 10.00% |
Legacy Ball | Defined Benefit Pension Plans | US Plan | Maximum | International bonds |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 15.00% |
Legacy Rexam | US Plan | Minimum | Cash and cash equivalents |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 0.00% |
Legacy Rexam | US Plan | Minimum | Fixed income securities |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 75.00% |
Legacy Rexam | US Plan | Minimum | Equity securities |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 10.00% |
Legacy Rexam | US Plan | Maximum | Cash and cash equivalents |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 10.00% |
Legacy Rexam | US Plan | Maximum | Fixed income securities |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 90.00% |
Legacy Rexam | US Plan | Maximum | Equity securities |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 25.00% |
Legacy Rexam | Defined Benefit Pension Plans | US Plan | Maximum | Domestic equities |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 20.00% |
Legacy Rexam | Defined Benefit Pension Plans | US Plan | Maximum | International equities |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 10.00% |
Legacy Rexam | Defined Benefit Pension Plans | US Plan | Maximum | Private equities |  |
Target asset allocations |  |
Target asset allocations (as a percent) | 10.00% |

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