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Employee benefits - Overfunded pension plans - Assets by category (Details) - Overfunded pension plans - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Assets by category |  |  |
International investments | $ 32 | $ 28 |
Real estate | 255 | 323 |
Loans to participants | 105 | 141 |
Total | 5,166 | 6,814 |
Funds not related to risk plans | (1,197) | (1,510) |
Fair value of plan assets at end of year | 3,969 | 5,304 |
Level 1 |  |  |
Assets by category |  |  |
International investments | 32 | 28 |
Total | 4,633 | 6,128 |
Level 2 |  |  |
Assets by category |  |  |
Total | 42 | 48 |
Level 3 |  |  |
Assets by category |  |  |
Real estate | 255 | 323 |
Loans to participants | 105 | 141 |
Total | 491 | 638 | $ 673
Corporate |  |  |
Assets by category |  |  |
Debt securities | 42 | 48 |
Corporate | Level 2 |  |  |
Assets by category |  |  |
Debt securities | 42 | 48 |
Government |  |  |
Assets by category |  |  |
Debt securities | 1,840 | 2,716 |
Government | Level 1 |  |  |
Assets by category |  |  |
Debt securities | 1,840 | 2,716 |
Fixed income |  |  |
Assets by category |  |  |
Investments funds | 2,242 | 2,668 |
Fixed income | Level 1 |  |  |
Assets by category |  |  |
Investments funds | 2,242 | 2,668 |
Investments in equity securities |  |  |
Assets by category |  |  |
Investments funds | 396 | 556 |
Investments in equity securities | Level 1 |  |  |
Assets by category |  |  |
Investments funds | 396 | 556 |
Private Equity funds |  |  |
Assets by category |  |  |
Structured investments | 126 | 157 |
Private Equity funds | Level 3 |  |  |
Assets by category |  |  |
Structured investments | 126 | 157 |
Real estate funds |  |  |
Assets by category |  |  |
Structured investments | 129 | 177 |
Real estate funds | Level 1 |  |  |
Assets by category |  |  |
Structured investments | 124 | 160 |
Real estate funds | Level 3 |  |  |
Assets by category |  |  |
Structured investments | $ 5 | $ 17 |

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