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Financing Arrangements - Total debt and 6% senior notes (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Financing Arrangements |  |
Total debt | $ 2,100 | $ 1,864

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant