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Financing (Senior Notes) (Narrative) (Details)
$ in Billions
12 Months Ended
Dec. 31, 2015
USD ($)
d
Rate
Debt Disclosure [Abstract]  
Unsecured senior notes description The Company has issued $1.4 billion aggregate principal amount of unsecured senior notes due between January 2021 and June 2023 with United Missouri Bank, N.A. as trustee. Interest on the senior notes, ranging from 3.800% to 4.875%, is payable semi-annually and is computed on the basis of a 360-day year.
Aggregate principle of unsecured senior notes | $ $ 1.4
Maturity date range, minimum Jan. 14, 2021
Maturity date range, maximum Jun. 20, 2023
Interest rate of notes, minimum 3.80%
Interest rate of notes, maximum 4.875%
Number of days in annual interest calculation period | d 360
Debt instrument covenant description Each of the senior notes is subject to certain customary covenants, with which the Company complied as of December 31, 2015.