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Segment Reporting (Details Textuals)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Mar. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
segment
Segment Reporting [Abstract]      
Number of Reportable Segments | segment     3
Whitnell      
Segment Reporting [Abstract]      
Gain (Loss) on Sale and Maturity of Other Investments, Before Tax   $ 2 $ 2
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain (Loss) on Sale and Maturity of Other Investments, Before Tax   $ 2 $ 2
ABRC      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Pre-tax book gain on sale $ 163