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Financing (Senior Notes) (Narrative) (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 17, 2017 USD ($) d Rate | Dec. 31, 2017 USD ($) d Rate
Financing |  |
Unsecured senior notes description |  | The Company has issued a cumulative $2.7 billion aggregate principal amount of unsecured senior notes, which are due between 2021 and 2027, with UMB as trustee. Interest on the senior notes, ranging from 3.550% to 4.875%, is payable semi-annually and is computed on the basis of a 360-day year.
Debt instrument covenant description |  | Each of the senior notes is subject to certain customary covenants, with which the Company complied as of December 31, 2017.
Senior notes [Member] |  |
Financing |  |
Number of days in annual interest calculation period | d |  | 360
Aggregate principle of unsecured senior notes | $ |  | $ 2,700
Minimum [Member] | Senior notes [Member] |  |
Financing |  |
Interest rate of senior notes |  | 3.55%
Senior notes maturity, year |  | 2021
Maximum [Member] | Senior notes [Member] |  |
Financing |  |
Interest rate of senior notes |  | 4.875%
Senior notes maturity, year |  | 2027
$750 million, 3.600% Senior Notes due 2027 [Member] |  |
Financing |  |
Interest rate of senior notes |  | 3.60%
Senior notes maturity, year |  | 2027
$750 million, 3.600% Senior Notes due 2027 [Member] | Senior notes [Member] |  |
Financing |  |
Issuance date of senior notes | Aug. 17, 2017 |
Face amount of senior notes | $ | $ 750 | $ 750
Interest rate of senior notes | 3.60% |
Senior notes maturity, year | 2027 |
Percentage of face value of debt instrument | 99.84% |
Number of days in annual interest calculation period | d | 360 |

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