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Business Segments (Narrative) (Details) $ in Millions	1 Months Ended		12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment			4
Segment Reporting Information [Line Items]
Expenses related to clearing default			$ 31
Loss due to commodities market default allocated to junior capital		$ 8
Increase decrease in total assets			346	$ 2,000
Capital relief program expense	$ 23
Restructuring charges			$ 0	$ 0	$ 41
Liability Waterfall
Segment Reporting Information [Line Items]
Loss due to commodities market default allocated to junior capital		$ 8

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Expense Related To Clearing Default

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Increase (Decrease) in Assets

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Loss Due To Commodities Market Default Allocated To Junior Capital

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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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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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