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Other Income (Expense), Net - Footnote (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Qualified Plan |  |  |  |
Employee Retirement Plans |  |  |  |
Settlement loss | $ 406 | $ 0 | $ 406 | $ 0

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