Capital Stock - Dividends Common Stock (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Equity [Abstract]
Fixed (in dollars per share)	$ 0.20	$ 0.20	$ 0.15	$ 0.15	$ 0.40	$ 0.30
Variable (in dollars per share)	0	0.37	0.45	0.41	0.37	0.86
Total (in dollars per share)	$ 0.20	$ 0.57	$ 0.60	$ 0.56	$ 0.77	$ 1.16
Total Dividends (In millions)	$ 153	$ 438	$ 484	$ 455	$ 591	$ 939