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Segment Reporting Segment Asset Reconciliation (Details) - USD ($) $ in Millions		Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Segment Reporting [Abstract]
Segment Assets		$ 39,828	$ 38,632	$ 44,441
Corporate Assets		4,170	4,417	5,094
Total assets of discontinued operations	[1]	0	65,634	66,594
Total Assets		$ 43,998	$ 108,683	$ 116,129
[1] See Note 5 - Divestitures and Other Transactions for additional information on discontinued operations.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount classified as assets attributable to disposal group held for sale or disposed of.

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