Acquisitions and Noncontrolling Interest - Redeemable Noncontrolling Interest (Details) $ in Millions |
12 Months Ended |
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Dec. 31, 2017
USD ($)
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| Reconciliation of Changes in the Redeemable Noncontrolling Interest [Roll Forward] | |
| Redeemable noncontrolling interest, beginning balance | $ 145 |
| Noncontrolling interest purchased related to USMM | (115) |
| Contribution from noncontrolling interest | 2 |
| Net losses attributable to noncontrolling interests | (20) |
| Redeemable noncontrolling interest, ending balance | $ 12 |
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- Definition Reconciliation of Changes in the Redeemable Noncontrolling Interest [Roll Forward] No definition available.
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- Definition Amount of Net Income (Loss) attributable to redeemable noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of increase in noncontrolling interest from a business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of increase in noncontrolling interest from sale of a portion of the parent's controlling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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