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Recent Accounting Pronouncements (Recently Adopted Accounting Standards) (Income Taxes) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Retained earnings | $ 49,076.2 | $ 49,076.2 | $ 48,325.8 |
Adjustments for New Accounting Pronouncement [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | $ 47.0 | $ 99.0 | $ 700.0 |
Accounting Standards Update 2016-06 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Retained earnings |  |  |  | $ 57.0

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