Common and Preferred Stock - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions														3 Months Ended												12 Months Ended
	Feb. 02, 2024	Dec. 21, 2023	Sep. 21, 2023	Jun. 22, 2023	Mar. 23, 2023	Dec. 21, 2022	Sep. 22, 2022	Jun. 23, 2022	Mar. 24, 2022	Dec. 22, 2021	Sep. 23, 2021	Jun. 23, 2021	Mar. 25, 2021	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021
Subsequent Event [Line Items]
Common dividends declared (in dollars per share)														$ 1.23	$ 1.23	$ 1.23	$ 1.23	$ 1.12	$ 1.12	$ 1.12	$ 1.12	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 4.92	$ 4.48		$ 4.00
Amount per share (in dollars per share)		$ 1.23	$ 1.23	$ 1.23	$ 1.23	$ 1.12	$ 1.12	$ 1.12	$ 1.12	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Total amount paid		$ 358	$ 362	$ 362	$ 368	$ 334	$ 341	$ 352	$ 357	$ 324	$ 330	$ 342	$ 345													$ 1,450	$ 1,384	[1]	$ 1,341	[1]
Subsequent Event
Subsequent Event [Line Items]
Common dividends declared (in dollars per share)	$ 1.40

[1] Amounts have been restated to reflect the adoption of Targeted Improvements to the Accounting for Long-Duration Contracts in 2023. See Note 2 to the Consolidated Financial Statements for further information.