Preferred Stock - Summary (Details) - USD ($) $ / shares in Units, $ in Millions								12 Months Ended
	Apr. 01, 2025	Mar. 31, 2025	Feb. 01, 2024	Jan. 31, 2024	Aug. 01, 2023	Jul. 31, 2023	Apr. 30, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Class of Stock [Line Items]
Shares (in shares)								2,005,375	2,005,375
Carrying value								$ 20,045	$ 20,050
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)								$ 575.00	$ 575.00	$ 575.00
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)								$ 600.00	$ 600.00	600.00
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)								$ 475.00	$ 475.00	475.00
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)								$ 455.00	$ 455.00	455.00
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)								$ 462.52	$ 462.52	462.52
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)								$ 420.00	$ 420.00	420.00
Series MM | Minimum
Class of Stock [Line Items]
Earliest redemption date								Sep. 01, 2026
Series Q
Class of Stock [Line Items]
Shares (in shares)								0	0
Carrying value								$ 0	$ 0
Issue date								Apr. 23, 2013
Contractual rate in effect							5.15%
Dividend declared per share (in dollars per share)								$ 0	$ 220.45	801.41
Dividend rate (in dollars per share)							$ 257.50
Series Q | Term SOFR
Class of Stock [Line Items]
Preferred stock dividend rate, variable, basis spread					3.25%			3.25%
Series Q | Minimum
Class of Stock [Line Items]
Earliest redemption date								May 01, 2023
Series R
Class of Stock [Line Items]
Shares (in shares)								0	0
Carrying value								$ 0	$ 0
Issue date								Jul. 29, 2013
Contractual rate in effect						6.00%
Dividend declared per share (in dollars per share)								$ 0	$ 221.70	756.73
Dividend rate (in dollars per share)						$ 300.00
Series R | Term SOFR
Class of Stock [Line Items]
Preferred stock dividend rate, variable, basis spread					3.30%			3.30%
Series R | Minimum
Class of Stock [Line Items]
Earliest redemption date								Aug. 01, 2023
Series S
Class of Stock [Line Items]
Shares (in shares)								0	0
Carrying value								$ 0	$ 0
Issue date								Jan. 22, 2014
Contractual rate in effect				6.75%
Dividend declared per share (in dollars per share)								$ 0	$ 233.70	675.00
Dividend rate (in dollars per share)				$ 337.50
Series S | Term SOFR
Class of Stock [Line Items]
Preferred stock dividend rate, variable, basis spread			3.78%					3.78%
Series S | Minimum
Class of Stock [Line Items]
Earliest redemption date								Feb. 01, 2024
Series U
Class of Stock [Line Items]
Shares (in shares)								0	0
Carrying value								$ 0	$ 0
Issue date								Mar. 10, 2014
Dividend declared per share (in dollars per share)								$ 0	$ 153.13	612.50
Series U | Term SOFR
Class of Stock [Line Items]
Preferred stock dividend rate, variable, basis spread								3.33%
Series U | Minimum
Class of Stock [Line Items]
Earliest redemption date								Apr. 30, 2024
Series X
Class of Stock [Line Items]
Shares (in shares)								0	0
Carrying value								$ 0	$ 0
Issue date								Sep. 23, 2014
Dividend declared per share (in dollars per share)								$ 0	$ 457.50	610.00
Series X | Term SOFR
Class of Stock [Line Items]
Preferred stock dividend rate, variable, basis spread								3.33%
Series X | Minimum
Class of Stock [Line Items]
Earliest redemption date								Oct. 01, 2024
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)								$ 709.88	$ 812.73	804.08
Series CC | Term SOFR
Class of Stock [Line Items]
Preferred stock dividend rate, variable, basis spread								2.58%
Series CC | Minimum
Class of Stock [Line Items]
Earliest redemption date								Nov. 01, 2022
Series FF
Class of Stock [Line Items]
Shares (in shares)								0	0
Carrying value								$ 0	$ 0
Issue date								Jul. 31, 2019
Dividend declared per share (in dollars per share)								$ 0	$ 250.00	500.00
Series FF | Term SOFR
Class of Stock [Line Items]
Preferred stock dividend rate, variable, basis spread								3.38%
Series FF | Minimum
Class of Stock [Line Items]
Earliest redemption date								Aug. 01, 2024
Series HH
Class of Stock [Line Items]
Shares (in shares)								0	300,000
Carrying value								$ 0	$ 3,000
Issue date								Jan. 23, 2020
Dividend declared per share (in dollars per share)								$ 0	$ 460.00	460.00
Series HH | Term SOFR
Class of Stock [Line Items]
Preferred stock dividend rate, variable, basis spread								3.125%
Series HH | Minimum
Class of Stock [Line Items]
Earliest redemption date								Feb. 01, 2025
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
Contractual rate in effect		4.00%
Dividend declared per share (in dollars per share)								$ 631.68	$ 400.00	400.00
Dividend rate (in dollars per share)		$ 200.00
Series II | Term SOFR
Class of Stock [Line Items]
Preferred stock dividend rate, variable, basis spread	2.745%							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)								$ 365.00	$ 365.00	$ 365.00
Series KK | Five-year CMT
Class of Stock [Line Items]
Preferred stock dividend rate, variable, basis spread								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)								$ 687.52	$ 494.63
Series NN | Five-year CMT
Class of Stock [Line Items]
Preferred stock dividend rate, variable, basis spread								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
Carrying value								$ 2,995
Issue date								Feb. 04, 2025
Contractual rate in effect								6.50%
Dividend declared per share (in dollars per share)								$ 590.42
Series OO | Five-year CMT
Class of Stock [Line Items]
Preferred stock dividend rate, variable, basis spread								2.152%
Series OO | Minimum
Class of Stock [Line Items]
Earliest redemption date								Apr. 01, 2030