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Basis of Presentation Basis of Presentation (Out-of-period-correction) (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($)
Net cash provided by (used in) operating activities [Member] |
Quantifying Misstatement in Current Year Financial Statements [Line Items] |
Net Cash Provided by (Used in) Operating Activities | $ 63
Net cash provided by (used in) investing activities [Member] |
Quantifying Misstatement in Current Year Financial Statements [Line Items] |
Net Cash Provided by (Used in) Operating Activities | $ 63

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