Quarterly Results (unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 16,506	$ 16,627	$ 15,714	$ 15,259	$ 14,832	$ 14,497	$ 13,979	$ 13,786	$ 64,106	$ 57,094	$ 51,411
Net income (loss) applicable to common shareholders, basic	1,899	1,161	301	1,189	1,460	(41)	(1,389)	(346)	4,550	(316)	(1,394)
Net income (loss) applicable to common shareholders, diluted	$ 1,899	$ 1,161	$ 301	$ 1,189	$ 1,460	$ (41)	$ (1,389)	$ (346)	$ 4,550	$ (316)	$ (1,394)
Net income (loss) applicable to common shareholders per common share - Basic (in dollars per share)	$ 7.16	$ 4.39	$ 1.14	$ 4.51	$ 5.57	$ (0.16)	$ (5.29)	$ (1.31)	$ 17.22	$ (1.20)	$ (5.14)
Net income (loss) applicable to common shareholders per common share - Diluted (in dollars per share)	$ 7.07	$ 4.33	$ 1.13	$ 4.46	$ 5.52	$ (0.16)	$ (5.29)	$ (1.31)	$ 16.99	$ (1.20)	$ (5.14)