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Segment Reporting Segment Asset Reconciliation (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Segment Reporting [Abstract]
Segment Assets	$ 36,800	$ 36,850	$ 37,390
Corporate Assets	4,696	5,799	4,790
Total Assets	$ 41,496	$ 42,649	$ 42,180

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- Definition

Corporate Assets

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- Definition

Segment Assets

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- Definition

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.

+ References

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