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Employee Benefit Plans - Textual (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2020 USD ($)
U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Company contributions |  | $ 87
Expected company contributions | $ 135 | 135
U.S. | Qualified Plan [Member] | Pension Plans Defined Benefit [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension Expense (Reversal of Expense), Noncash | 27 |
Increase (Decrease) in Obligation, Pension Benefits | 78 |
Int'l (Pension Benefits) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Company contributions |  | 57
Expected company contributions | $ 65 | $ 65

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