Preferred Stock - Summary (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Class of Stock [Line Items]
Shares (in shares)	2,005,375		2,005,375
Carrying value	$ 20,045		$ 20,045
Series DD
Class of Stock [Line Items]
Shares (in shares)	169,625		169,625
Carrying value	$ 1,696		$ 1,696
Issue date	Sep. 21, 2018
Contractual rate in effect	5.75%
Dividend declared per share (in dollars per share)	$ 143.75	$ 143.75
Series DD | Minimum
Class of Stock [Line Items]
Earliest redemption date	Dec. 01, 2023
Series EE
Class of Stock [Line Items]
Shares (in shares)	185,000		185,000
Carrying value	$ 1,850		$ 1,850
Issue date	Jan. 24, 2019
Contractual rate in effect	6.00%
Dividend declared per share (in dollars per share)	$ 150.00	150.00
Series EE | Minimum
Class of Stock [Line Items]
Earliest redemption date	Mar. 01, 2024
Series GG
Class of Stock [Line Items]
Shares (in shares)	90,000		90,000
Carrying value	$ 900		$ 900
Issue date	Nov. 07, 2019
Contractual rate in effect	4.75%
Dividend declared per share (in dollars per share)	$ 118.75	118.75
Series GG | Minimum
Class of Stock [Line Items]
Earliest redemption date	Dec. 01, 2024
Series JJ
Class of Stock [Line Items]
Shares (in shares)	150,000		150,000
Carrying value	$ 1,500		$ 1,500
Issue date	Mar. 17, 2021
Contractual rate in effect	4.55%
Dividend declared per share (in dollars per share)	$ 113.75	113.75
Series JJ | Minimum
Class of Stock [Line Items]
Earliest redemption date	Jun. 01, 2026
Series LL
Class of Stock [Line Items]
Shares (in shares)	185,000		185,000
Carrying value	$ 1,850		$ 1,850
Issue date	May 20, 2021
Contractual rate in effect	4.625%
Dividend declared per share (in dollars per share)	$ 115.63	115.63
Series LL | Minimum
Class of Stock [Line Items]
Earliest redemption date	Jun. 01, 2026
Series MM
Class of Stock [Line Items]
Shares (in shares)	200,000		200,000
Carrying value	$ 2,000		$ 2,000
Issue date	Jul. 29, 2021
Contractual rate in effect	4.20%
Dividend declared per share (in dollars per share)	$ 105.00	105.00
Series MM | Minimum
Class of Stock [Line Items]
Earliest redemption date	Sep. 01, 2026
Series CC
Class of Stock [Line Items]
Shares (in shares)	125,750		125,750
Carrying value	$ 1,258		$ 1,258
Issue date	Oct. 20, 2017
Dividend declared per share (in dollars per share)	$ 159.02	172.36
Series CC | SOFR
Class of Stock [Line Items]
Floating annualized rate	2.58%
Series CC | Minimum
Class of Stock [Line Items]
Earliest redemption date	Nov. 01, 2022
Series II
Class of Stock [Line Items]
Shares (in shares)	150,000		150,000
Carrying value	$ 1,500		$ 1,500
Issue date	Feb. 24, 2020
Dividend declared per share (in dollars per share)	$ 158.37	100.00
Series II | SOFR
Class of Stock [Line Items]
Floating annualized rate	2.745%
Series II | Minimum
Class of Stock [Line Items]
Earliest redemption date	Apr. 01, 2025
Series KK
Class of Stock [Line Items]
Shares (in shares)	200,000		200,000
Carrying value	$ 2,000		$ 2,000
Issue date	May 12, 2021
Contractual rate in effect	3.65%
Dividend declared per share (in dollars per share)	$ 91.25	91.25
Series KK | CMT
Class of Stock [Line Items]
Floating annualized rate	2.85%
Series KK | Minimum
Class of Stock [Line Items]
Earliest redemption date	Jun. 01, 2026
Series NN
Class of Stock [Line Items]
Shares (in shares)	250,000		250,000
Carrying value	$ 2,496		$ 2,496
Issue date	Mar. 12, 2024
Contractual rate in effect	6.875%
Dividend declared per share (in dollars per share)	$ 171.88	171.88
Series NN | CMT
Class of Stock [Line Items]
Floating annualized rate	2.737%
Series NN | Minimum
Class of Stock [Line Items]
Earliest redemption date	Jun. 01, 2029
Series OO
Class of Stock [Line Items]
Shares (in shares)	300,000		300,000
Carrying value	$ 2,995		$ 2,995
Issue date	Feb. 04, 2025
Contractual rate in effect	6.50%
Dividend declared per share (in dollars per share)	$ 162.50	$ 102.92
Series OO | CMT
Class of Stock [Line Items]
Floating annualized rate	2.152%
Series OO | Minimum
Class of Stock [Line Items]
Earliest redemption date	Apr. 01, 2030