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Certain Transfers of Financial Assets and Variable Interest Entities Tax Credit Variable Interest Entities (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Other Assets [1] $ 9,432 $ 9,418
Community Development Investments [Member]    
Other Assets [2] 1,515 1,272
Community Development Investments [Member] | Limited Partner [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]    
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount [3] 2,173 1,905
Renewable Energy Program [Member]    
Other Assets 68 0
Renewable Energy Program [Member] | Limited Partner [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]    
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount [3] $ 165 $ 0
[1] Beginning January 1, 2018, the Company reclassified equity securities previously presented in Securities available for sale to Other assets. Reclassifications have been made to previously reported amounts for comparability.
[2] At September 30, 2018 and December 31, 2017, the carrying value of community development investments excludes $67 million and $59 million of investments in funds that do not qualify for tax credits, respectively.
[3] At September 30, 2018 and December 31, 2017, the Company's maximum exposure to loss related to community development investments includes $484 million and $354 million of loans and $648 million and $627 million of unfunded equity commitments, respectively. At September 30, 2018 and December 31, 2017, the Company's maximum exposure to loss related to renewable energy partnerships includes $97 million and $0 of unfunded equity commitments, respectively.