Segment Reporting Segment Asset Reconciliation (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Segment Reporting Information [Line Items]
Total Assets	$ 43,110	$ 42,618	$ 40,651
Segments
Segment Reporting Information [Line Items]
Total Assets	38,275	37,049	36,139
Corporate
Segment Reporting Information [Line Items]
Total Assets	$ 4,835	$ 5,569	$ 4,512