Commitments and Contingent Liabilities Variable Interest Entities (Details) - USD ($) $ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
---|---|---|
Other Assets [Member] | ||
Variable Interest Entity [Line Items] | ||
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | $ 259 | $ 237 |
Other Liabilities [Member] | ||
Variable Interest Entity [Line Items] | ||
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net | $ 82 | $ 74 |