Capital Stock: (Narrative) (Details) - USD ($)			3 Months Ended	8 Months Ended	12 Months Ended			36 Months Ended
	May 11, 2022	Jun. 11, 2021	Mar. 31, 2022	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jun. 11, 2024
Class of Stock [Line Items]
Common stock, shares authorized (in shares)					6,000,000,000
Stock repurchase program, authorized amount		$ 7,000,000,000
Repurchases of common stock					$ 209,000,000	$ 775,000,000	$ 0
Stock repurchase program, period	3 years	3 years
Common stock repurchased (in shares)			2,000,000	10,500,000
Common stock repurchased, at cost			$ 199,000,000	$ 1,000,000,000	$ 199,000,000	$ 785,000,000
Shares of common stock reserved (in shares)					33,284,616
Preferred stock shares authorized (in shares)					250,000,000
Minimum | Forecast
Class of Stock [Line Items]
Repurchases of common stock								$ 5,000,000,000
Maximum | Forecast
Class of Stock [Line Items]
Repurchases of common stock								$ 7,000,000,000