Business and Basis of Presentation (Narrative) (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2016 USD ($)	Jun. 30, 2016 division
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of divisions \| division		4
Income From Continuing Operations Before Income Taxes And Equity In Earnings Of Operating Joint Ventures [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Out of Period Adjustment Increase/Benefit (Decrease/Charge) \| $	$ (148)

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

No definition available.

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration