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Debt And Other Credit Facilities Debt And Other Credit Facilities (Tables)
12 Months Ended
Dec. 31, 2015
Debt Disclosure [Abstract]  
Combined Principal Installments For Both Classes Of Bonds And Subordinated Notes
The following table summarizes the combined principal installments for both classes of bonds and subordinated notes, including inflation adjusted bond indexation over the next five years and beyond as of December 31, 2015:
Dollars in millions
Payments Due
2016
$
10

2017
$
10

2018
$
10

2019
$
11

2020
$
12

Beyond 2020
$
8