Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended
	Oct. 31, 2022	Oct. 03, 2022	Feb. 01, 2022	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares (in shares)				2,740,375		2,740,375
Carrying value				$ 27,404		$ 27,404
Liquidation value and redemption price per share (in dollars per share)				$ 10,000
Aggregate liquidation value				$ 27,700
Series DD
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
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
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Earliest redemption date				Dec. 01, 2023
Series EE
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
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
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Earliest redemption date				Mar. 01, 2024
Series GG
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
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
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Earliest redemption date				Dec. 01, 2024
Series JJ
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
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
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Earliest redemption date				Jun. 01, 2026
Series LL
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
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
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Earliest redemption date				Jun. 01, 2026
Series MM
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
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
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Earliest redemption date				Sep. 01, 2026
Series I
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares (in shares)				0		0
Carrying value				$ 0		$ 0
Issue date				Apr. 23, 2008
Dividend declared per share (in dollars per share)				$ 0	92.13
Preferred stock redeemed	$ 2,930
Series I | Three-month LIBOR
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock dividend rate, variable, basis spread				3.47%
Series I | Minimum
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Earliest redemption date				Apr. 30, 2018
Series Q
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares (in shares)				150,000		150,000
Carrying value				$ 1,500		$ 1,500
Issue date				Apr. 23, 2013
Contractual rate in effect				5.15%
Dividend declared per share (in dollars per share)				$ 128.75	128.75
Series Q | Three-month LIBOR
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock dividend rate, variable, basis spread				3.25%
Series Q | Minimum
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Earliest redemption date				May 01, 2023
Series R
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares (in shares)				150,000		150,000
Carrying value				$ 1,500		$ 1,500
Issue date				Jul. 29, 2013
Contractual rate in effect				6.00%
Dividend declared per share (in dollars per share)				$ 150.00	150.00
Series R | Three-month LIBOR
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock dividend rate, variable, basis spread				3.30%
Series R | Minimum
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Earliest redemption date				Aug. 01, 2023
Series S
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares (in shares)				200,000		200,000
Carrying value				$ 2,000		$ 2,000
Issue date				Jan. 22, 2014
Contractual rate in effect				6.75%
Dividend declared per share (in dollars per share)				$ 168.75	168.75
Series S | Three-month LIBOR
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock dividend rate, variable, basis spread				3.78%
Series S | Minimum
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Earliest redemption date				Feb. 01, 2024
Series U
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares (in shares)				100,000		100,000
Carrying value				$ 1,000		$ 1,000
Issue date				Mar. 10, 2014
Contractual rate in effect				6.125%
Dividend declared per share (in dollars per share)				$ 153.13	153.13
Series U | Three-month LIBOR
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock dividend rate, variable, basis spread				3.33%
Series U | Minimum
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Earliest redemption date				Apr. 30, 2024
Series V
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares (in shares)				0		0
Carrying value				$ 0		$ 0
Issue date				Jun. 09, 2014
Dividend declared per share (in dollars per share)				$ 0	86.40
Preferred stock redeemed		$ 2,500
Series V | Three-month LIBOR
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock dividend rate, variable, basis spread				3.32%
Series V | Minimum
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Earliest redemption date				Jul. 01, 2019
Series X
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares (in shares)				160,000		160,000
Carrying value				$ 1,600		$ 1,600
Issue date				Sep. 23, 2014
Contractual rate in effect				6.10%
Dividend declared per share (in dollars per share)				$ 152.50	152.50
Series X | Three-month LIBOR
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock dividend rate, variable, basis spread				3.33%
Series X | Minimum
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Earliest redemption date				Oct. 01, 2024
Series Z
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares (in shares)				0		0
Carrying value				$ 0		$ 0
Issue date				Apr. 21, 2015
Dividend declared per share (in dollars per share)				$ 0	0
Preferred stock redeemed			$ 2,000
Series Z | Three-month LIBOR
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock dividend rate, variable, basis spread				3.80%
Series Z | Minimum
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Earliest redemption date				May 01, 2020
Series CC
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares (in shares)				125,750		125,750
Carrying value				$ 1,258		$ 1,258
Issue date				Oct. 20, 2017
Contractual rate in effect	4.625%			2.58%
Dividend declared per share (in dollars per share)	$ 231.25			$ 182.79	115.63
Series CC | Three-month LIBOR
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock dividend rate, variable, basis spread				2.58%
Series CC | Minimum
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Earliest redemption date				Nov. 01, 2022
Series FF
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares (in shares)				225,000		225,000
Carrying value				$ 2,250		$ 2,250
Issue date				Jul. 31, 2019
Contractual rate in effect				5.00%
Dividend declared per share (in dollars per share)				$ 125.00	125.00
Series FF | Three-month term SOFR
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock dividend rate, variable, basis spread				3.38%
Series FF | Minimum
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Earliest redemption date				Aug. 01, 2024
Series HH
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares (in shares)				300,000		300,000
Carrying value				$ 3,000		$ 3,000
Issue date				Jan. 23, 2020
Contractual rate in effect				4.60%
Dividend declared per share (in dollars per share)				$ 115.00	115.00
Series HH | Three-month term SOFR
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock dividend rate, variable, basis spread				3.125%
Series HH | Minimum
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Earliest redemption date				Feb. 01, 2025
Series II
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
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)				$ 100.00	100.00
Series II | Three-month term SOFR
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock dividend rate, variable, basis spread				2.745%
Series II | Minimum
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Earliest redemption date				Apr. 01, 2025
Series KK
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
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 | Five-year CMT
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock dividend rate, variable, basis spread				2.85%
Series KK | Minimum
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Earliest redemption date				Jun. 01, 2026