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Major Accounting Policies - Revenue Recognition (Details) $ in Millions	12 Months Ended
	Dec. 31, 2014 segment	Jan. 01, 2018 USD ($)
New accounting pronouncements implemented
Number of operating segments | segment	4
Minimum | ASU 2014-09
New accounting pronouncements implemented
Decrease in expected earnings		$ 300
Maximum | ASU 2014-09
New accounting pronouncements implemented
Decrease in expected earnings		$ 350

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- Definition

The amount of decrease in expected earnings due to recent updates in Accounting Standards.

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- Definition

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.

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