Capital Stock - Dividends Common Stock (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Equity [Abstract]
Base (in dollars per share)	$ 0.21	$ 0.21	$ 0.21	$ 0.20	$ 0.20	$ 0.20	$ 0.63	$ 0.60
Variable (in dollars per share)	0	0	0	0	0	0.37	0	0.37
Total (in dollars per share)	$ 0.21	$ 0.21	$ 0.21	$ 0.20	$ 0.20	$ 0.57	$ 0.63	$ 0.97
Total dividends	$ 156	$ 158	$ 160	$ 153	$ 153	$ 438	$ 474	$ 744