Stockholders' Equity - Stock Repurchase Program (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended	9 Months Ended	139 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Jun. 30, 2024	Sep. 30, 2024	Sep. 08, 2024
Class of Stock [Line Items]
Stock repurchased during period (in shares)			373
Stock repurchased during period	$ 72	$ 274	$ 16,834
Remaining amount authorized under the stock repurchase program				$ 1,166
Common Stock
Class of Stock [Line Items]
Stock repurchase program, aggregate authorized amount				$ 1,166
Common Stock | Old Sirius
Class of Stock [Line Items]
Stock repurchase program, aggregate authorized amount					$ 18,000