New Accounting Pronouncements (Details) - Subsequent Event $ in Billions |
Jan. 01, 2019
USD ($)
|
|---|---|
| Minimum | |
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |
| New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | $ 1.0 |
| Maximum | |
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |
| New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | $ 1.2 |