Investments (Fair Values by Classification) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Fair values of available-for-sale investments by classification in the Consolidated Balance Sheets
Marketable securities	$ 1,976	$ 48
Total interest-bearing securities	10,921	7,304
Available-for-sale investments [Member]
Fair values of available-for-sale investments by classification in the Consolidated Balance Sheets
Cash and cash equivalents	8,945	7,256
Marketable securities	1,976	48
Total interest-bearing securities	$ 10,921	$ 7,304