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Short-term Financing Short-term Financing - Commercial Paper program (Tables)
 3 Months Ended
Sep. 30, 2019
Commercial paper program [Abstract]  
Commercial Paper Program [Table Text Block] Details of the borrowings under the commercial paper program are as follows:
 
Three Months Ended
 
September 30,
 
2019
 
2018
Average daily borrowings (in billions)
$
4.0

 
$
3.7

Weighted average interest rates
2.3
%
 
2.0
%
Weighted average maturity (approximately in days)
2 days

 
2 days