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Employee Benefits - Net Postretirement Benefit Cost and the Amount Recognized in OCI for All Funded and Unfunded Plans (Details) - Other Postretirement Benefit Plans [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost of benefits earned | $ (1) | $ (1) | $ (1)
Interest cost on APBO | (2) | (2) | (3)
Expected return on plan assets | (2) | (2) | (2)
Amortization of prior service credit | 0 | (1) | (1)
Amortization of gains | (1) | (1) | 0
Net pension cost (benefit) | (1) | (1) | 1
Other changes in plan assets and benefit obligations recognized in OCI: |  |  |
Net (gain) loss | 1 | 1 | (4)
Amortization of prior service credit | 1 | 1 | 1
Amortization of losses | 0 | 0 | 0
Total recognized in comprehensive income | 2 | 2 | (3)
Total recognized in net postretirement benefit cost and comprehensive income | $ 2 | $ 1 | $ (2)

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- Definition Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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