Stockholders' Equity (Summary Of Dividends Paid On Common Stock) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended												12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Stockholders Equity [Line Items]
Dividends amount	$ 143	$ 272	$ 223	$ 299	$ 488	$ 312	$ 462	$ 596	$ 875	$ 1,007	$ 830	$ 667	$ 937	$ 1,858	$ 3,379
Dividends rate per share	$ 0.22	$ 0.44	$ 0.35	$ 0.44	$ 0.77	$ 0.49	$ 0.72	$ 0.89	$ 1.35	$ 1.55	$ 1.27	$ 1
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
Fixed Dividend Date December 31, 2024
Stockholders Equity [Line Items]
Dividends amount	$ 143
Fixed Dividend Year to Date 2024
Stockholders Equity [Line Items]
Dividends amount													560
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
Variable Dividend Date December 31, 2024
Stockholders Equity [Line Items]
Dividends amount	$ 0
Variable Dividend Year to Date 2024
Stockholders Equity [Line Items]
Dividends amount													$ 377
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
Fixed Dividend Date December 31, 2023
Stockholders Equity [Line Items]
Dividends amount					$ 127
Fixed Dividend Year to Date 2023
Stockholders Equity [Line Items]
Dividends amount														515
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
Variable Dividend Date December 31, 2023
Stockholders Equity [Line Items]
Dividends amount					$ 361
Variable Dividend Year to Date 2023
Stockholders Equity [Line Items]
Dividends amount														$ 1,343
Fixed Dividend Date March 31, 2022
Stockholders Equity [Line Items]
Dividends amount												$ 109
Fixed Dividend Date June 30, 2022
Stockholders Equity [Line Items]
Dividends amount											$ 105
Fixed Dividend Date September 30, 2022
Stockholders Equity [Line Items]
Dividends amount										$ 117
Fixed Dividend Date December 31, 2022
Stockholders Equity [Line Items]
Dividends amount									$ 117
Fixed Dividend Year to Date 2022
Stockholders Equity [Line Items]
Dividends amount															448
Variable Dividend Date March 31, 2022
Stockholders Equity [Line Items]
Dividends amount												$ 558
Variable Dividend Date June 30, 2022
Stockholders Equity [Line Items]
Dividends amount											$ 725
Variable Dividend Date September 30, 2022
Stockholders Equity [Line Items]
Dividends amount										$ 890
Variable Dividend Date December 31, 2022
Stockholders Equity [Line Items]
Dividends amount									$ 758
Variable Dividend Year to Date 2022
Stockholders Equity [Line Items]
Dividends amount															$ 2,931