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Business Disposition and Discontinued Operations - Cash Flows from Discontinued Operations (Details) - Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Net cash provided by operating activities from discontinued operations $ 267
Net cash used in investing activities from discontinued operations (187)
Net cash used in financing activities from discontinued operations (340)
Cash paid for interest $ 2