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Stockholders' Equity (Summary Of Dividends Paid On Common Stock) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended												12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stockholders Equity [Line Items]
Dividends amount	$ 554	$ 329	$ 229	$ 203	$ 138	$ 43	$ 42	$ 34	$ 34	$ 35	$ 37	$ 34	$ 1,315	$ 257	$ 140
Dividends rate per share	$ 0.84	$ 0.49	$ 0.34	$ 0.30	$ 0.37	$ 0.11	$ 0.11	$ 0.09	$ 0.09	$ 0.09	$ 0.09	$ 0.08
Fixed Dividend [Member]
Stockholders Equity [Line Items]
Dividends amount	$ 73	$ 74	$ 75	$ 76	$ 41	$ 43	$ 42	$ 34	$ 34	$ 35	$ 37	$ 34	298	160	$ 140
Variable Dividend [Member]
Stockholders Equity [Line Items]
Dividends amount	$ 481	$ 255	$ 154	$ 127	$ 97								$ 1,017	$ 97

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Stockholders equity.

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

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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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