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Employee Benefits - Plans ABO in Excess of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
ABO | $ 1,200 | $ 1,200
Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
PBO | 1,054 | 1,029
ABO | 1,054 | 1,029
Fair value of plan assets | 1,102 | 1,046
Other Defined Benefit Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
PBO | 179 | 172
ABO | 179 | 172
Fair value of plan assets | $ 0 | $ 0

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