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Variable Interest Entities - Summary of Assets and Liabilities Related to Consolidated Variable Interest Entities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Variable interest entities [Member]    
Variable Interest Entity [Line Items]    
Consolidated Assets $ 98 $ 112
Consolidated Liabilities 38 103
Other assets [Member] | Low income housing limited liability partnership [Member]    
Variable Interest Entity [Line Items]    
Consolidated Assets 98 112
Long-term debt [Member] | Low income housing limited liability partnership [Member]    
Variable Interest Entity [Line Items]    
Consolidated Liabilities 0 66
Interest, taxes and other liabilities [Member] | Low income housing limited liability partnership [Member]    
Variable Interest Entity [Line Items]    
Consolidated Liabilities $ 38 $ 37