Annual report pursuant to Section 13 and 15(d)

Variable Interest Entities (Summary of Key Terms of NMTC Transactions) (Details)

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Variable Interest Entities (Summary of Key Terms of NMTC Transactions) (Details) - Primary Beneficiary - USD ($)
$ in Millions
Oct. 02, 2019
Dec. 22, 2017
Mar. 21, 2017
Variable Interest Entity [Line Items]      
Loan Amount $ 4.8 $ 10.4 $ 6.7
Interest Rate on Loan 1.00% 1.00% 1.00%
US Bancorp Investment      
Variable Interest Entity [Line Items]      
Financial support to other entity $ 2.2 $ 5.1 $ 3.3
Loan to Unicom      
Variable Interest Entity [Line Items]      
Interest Rate on Loan 1.80%   0.70%
Financial support to other entity $ 6.7 $ 14.7 $ 9.8
Loan to Unicom | Minimum      
Variable Interest Entity [Line Items]      
Interest Rate on Loan   0.70%  
Loan to Unicom | Maximum      
Variable Interest Entity [Line Items]      
Interest Rate on Loan   1.20%