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Stockholders' Equity (Summary Of Dividends Paid On Common Stock) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Stockholders Equity [Line Items]
Total dividends amount	$ 203	$ 34
Dividends rate per share	$ 0.30
Fixed Dividend [Member]
Stockholders Equity [Line Items]
Dividends amount	$ 76	$ 34
Dividends rate per share	$ 0.11	$ 0.09
Variable Dividend [Member]
Stockholders Equity [Line Items]
Dividends amount	$ 127
Dividends rate per share	$ 0.19

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Stockholders equity.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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Cash outflow in the form of ordinary dividends to common shareholders, preferred shareholders and noncontrolling interests, generally out of earnings.

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