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Employee Benefit Plans - Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | $ 101 |
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | 103 | $ 281
Employer contributions | 103 | 280
Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | 0 | 0
Employer contributions | $ 0 | $ 0

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