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Stockholders' Equity (Summary Of Dividends Paid On Common Stock) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Stockholders Equity [Line Items]
Dividends amount	$ 329	$ 229	$ 203	$ 43	$ 42	$ 34	$ 761	$ 119
Dividends rate per share	$ 0.49	$ 0.34	$ 0.30	$ 0.11	$ 0.11	$ 0.09
Fixed Dividend [Member]
Stockholders Equity [Line Items]
Dividends amount	$ 74	$ 75	$ 76	$ 43	$ 42	$ 34	225	$ 119
Variable Dividend [Member]
Stockholders Equity [Line Items]
Dividends amount	$ 255	$ 154	$ 127				$ 536

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Stockholders equity.

+ References

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585

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