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Employee Benefits Assets and Liabilities associated with Non-qualified benefit plans (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Document Period End Date | Dec. 31, 2019 |
Non-qualified benefit plan trust | $ 38 | $ 36
Non-qualified benefit plan liabilities | 103 | 103
Other Postretirement Benefit Plans [Domain] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Non-qualified benefit plan trust | 0 | 0
Defined Benefit Pension Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Non-qualified benefit plan trust | 21 | 20
Non-qualified benefit plan liabilities | 79 | 81
Non Qualified Benefit Plans [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Non-qualified benefit plan trust | 17 | 16
Non-qualified benefit plan liabilities | $ 24 | $ 22

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