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Benefit Plans - Pension plan assets by category and FV (Details) - Pension Plan - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
US |  |  |
Plan assets |  |  |
Fair value of plan assets | $ 439 | $ 408 | $ 353
US | Equity index - U.S. |  |  |
Plan assets |  |  |
Fair value of plan assets | 45 | 43 |
US | Equity index - International |  |  |
Plan assets |  |  |
Fair value of plan assets | 44 | 42 |
US | Fixed income index- Long bond |  |  |
Plan assets |  |  |
Fair value of plan assets | $ 276 | $ 295 |
US | Fixed income index- Long bond | Minimum |  |  |
Plan assets |  |  |
Fixed income securities maturity (in years) | 10 years | 10 years |
US | Fixed income index - Long government bond |  |  |
Plan assets |  |  |
Fair value of plan assets | $ 69 | $ 25 |
US | Fixed income index - Long government bond | Minimum |  |  |
Plan assets |  |  |
Fixed income securities maturity (in years) | 10 years | 10 years |
US | Cash |  |  |
Plan assets |  |  |
Fair value of plan assets | $ 5 | $ 3 |
US | Fair Value, Inputs, Level 2 |  |  |
Plan assets |  |  |
Fair value of plan assets | 439 | 408 |
US | Fair Value, Inputs, Level 2 | Equity index - U.S. |  |  |
Plan assets |  |  |
Fair value of plan assets | 45 | 43 |
US | Fair Value, Inputs, Level 2 | Equity index - International |  |  |
Plan assets |  |  |
Fair value of plan assets | 44 | 42 |
US | Fair Value, Inputs, Level 2 | Fixed income index- Long bond |  |  |
Plan assets |  |  |
Fair value of plan assets | 276 | 295 |
US | Fair Value, Inputs, Level 2 | Fixed income index - Long government bond |  |  |
Plan assets |  |  |
Fair value of plan assets | 69 | 25 |
US | Fair Value, Inputs, Level 2 | Cash |  |  |
Plan assets |  |  |
Fair value of plan assets | 5 | 3 |
Non-US |  |  |
Plan assets |  |  |
Fair value of plan assets | 249 | 231 | $ 207
Non-US | Equity index - U.S. |  |  |
Plan assets |  |  |
Fair value of plan assets | 26 | 22 |
Non-US | Equity index - International |  |  |
Plan assets |  |  |
Fair value of plan assets | 19 | 17 |
Non-US | Fixed income index- Short bond |  |  |
Plan assets |  |  |
Fair value of plan assets | 31 |  |
Non-US | Fixed income index - Intermediate bond |  |  |
Plan assets |  |  |
Fair value of plan assets | 38 | 52 |
Non-US | Fixed income index- Long bond |  |  |
Plan assets |  |  |
Fair value of plan assets | 106 | 95 |
Non-US | Other |  |  |
Plan assets |  |  |
Fair value of plan assets | 26 | 24 |
Non-US | Cash |  |  |
Plan assets |  |  |
Fair value of plan assets | 3 | 21 |
Non-US | Fair Value, Inputs, Level 1 |  |  |
Plan assets |  |  |
Fair value of plan assets | 3 | 2 |
Non-US | Fair Value, Inputs, Level 1 | Cash |  |  |
Plan assets |  |  |
Fair value of plan assets | 3 | 2 |
Non-US | Fair Value, Inputs, Level 2 |  |  |
Plan assets |  |  |
Fair value of plan assets | 246 | 229 |
Non-US | Fair Value, Inputs, Level 2 | Equity index - U.S. |  |  |
Plan assets |  |  |
Fair value of plan assets | 26 | 22 |
Non-US | Fair Value, Inputs, Level 2 | Equity index - International |  |  |
Plan assets |  |  |
Fair value of plan assets | 19 | 17 |
Non-US | Fair Value, Inputs, Level 2 | Fixed income index- Short bond |  |  |
Plan assets |  |  |
Fair value of plan assets | 31 |  |
Non-US | Fair Value, Inputs, Level 2 | Fixed income index - Intermediate bond |  |  |
Plan assets |  |  |
Fair value of plan assets | 38 | 52 |
Non-US | Fair Value, Inputs, Level 2 | Fixed income index- Long bond |  |  |
Plan assets |  |  |
Fair value of plan assets | 106 | 95 |
Non-US | Fair Value, Inputs, Level 2 | Other |  |  |
Plan assets |  |  |
Fair value of plan assets | $ 26 | 24 |
Non-US | Fair Value, Inputs, Level 2 | Cash |  |  |
Plan assets |  |  |
Fair value of plan assets |  | $ 19 |

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