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New Accounting Standards Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Deferred tax asset from stock options exercised and restricted stock vestings | $ 179 |
Minimum [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New Accounting Pronouncement or Change in Accounting Principle, Description |  | 10.00%
Maximum [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New Accounting Pronouncement or Change in Accounting Principle, Description |  | 15.00%

X
- Definition Deferred tax asset from stock options exercised and restricted stock vestings on a modified retrospective basis through a cumulative-effect adjustment to retained earnings. + References No definition available. + Details
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