Accounting Policies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Accounting Policies [Abstract]
Operating lease liability	$ 227		$ 227		$ 198
Operating lease liability, current, Statement of Financial Position	Other Liabilities		Other Liabilities		Other Liabilities
Operating lease right-of-use asset	$ 206		$ 206		$ 176
Operating lease, right-of-use asset, Statement of Financial Position	Other Assets		Other Assets		Other Assets
Weighted average common shares adjustment related to stock-based compensation (shares)	0	100,000	100,000	100,000
Anti-dilutive potential common shares related to stock-based compensation plans (shares)	0		0	0
Maturities of short term investments			3 months