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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, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Stockholders Equity [Line Items]
Dividends amount	$ 272	$ 223	$ 299	$ 312	$ 462	$ 596	$ 794	$ 1,370
Dividends rate per share	$ 0.44	$ 0.35	$ 0.44	$ 0.49	$ 0.72	$ 0.89
Fixed Dividend Date March 31, 2024
Stockholders Equity [Line Items]
Dividends amount			$ 143
Fixed Dividend Date June 30, 2024
Stockholders Equity [Line Items]
Dividends amount		$ 138
Fixed Dividend Date September 30, 2024
Stockholders Equity [Line Items]
Dividends amount	$ 136
Variable Dividend Date March 31, 2024
Stockholders Equity [Line Items]
Dividends amount			$ 156
Variable Dividend Date June 30, 2024
Stockholders Equity [Line Items]
Dividends amount		$ 85
Variable Dividend Date September 30, 2024
Stockholders Equity [Line Items]
Dividends amount	$ 136
Fixed Dividend Date March 31, 2023
Stockholders Equity [Line Items]
Dividends amount						$ 133
Fixed Dividend Date June 30, 2023
Stockholders Equity [Line Items]
Dividends amount					$ 128
Fixed Dividend Date September 30, 2023
Stockholders Equity [Line Items]
Dividends amount				$ 127
Variable Dividend Date March 31, 2023
Stockholders Equity [Line Items]
Dividends amount						$ 463
Variable Dividend Date June 30, 2023
Stockholders Equity [Line Items]
Dividends amount					$ 334
Variable Dividend Date September 30, 2023
Stockholders Equity [Line Items]
Dividends amount				$ 185
Fixed Dividend Year to Date 2024
Stockholders Equity [Line Items]
Dividends amount							417
Variable Dividend Year to Date 2024
Stockholders Equity [Line Items]
Dividends amount							$ 377
Fixed Dividend Year to Date 2023
Stockholders Equity [Line Items]
Dividends amount								388
Variable Dividend Year to Date 2023
Stockholders Equity [Line Items]
Dividends amount								$ 982

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
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