Equity - Schedule of Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Jun. 04, 2008	May 22, 2008	May 19, 2008	Dec. 14, 2007	Nov. 21, 2007
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	555,374,922	555,374,922
Preferred stock	$ 19,130	$ 19,130
Preferred stock, shares outstanding (in shares)	555,374,922	555,374,922
Series D
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	3,000,000	3,000,000
Preferred stock	$ 150	$ 150
Preferred stock, stated value per share (in dollars per share)	$ 50
Preferred stock, annual dividend rate	5.25%
Series E
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	3,000,000	3,000,000
Preferred stock	$ 150	$ 150
Preferred stock, stated value per share (in dollars per share)	$ 50
Preferred stock, annual dividend rate	5.10%
Series F
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	14,000,000	14,000,000
Preferred stock	$ 690	$ 690
Preferred stock, stated value per share (in dollars per share)	$ 50
Preferred stock, annual dividend rate	2.016%
Preferred stock, redemption terms	two
Series G
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	6,000,000	6,000,000
Preferred stock	$ 288	$ 288
Preferred stock, stated value per share (in dollars per share)	$ 50
Preferred stock, annual dividend rate	4.024%
Preferred stock, redemption terms	two
Series H
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	8,000,000	8,000,000
Preferred stock	$ 400	$ 400
Preferred stock, stated value per share (in dollars per share)	$ 50
Preferred stock, annual dividend rate	5.81%
Series I
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	6,000,000	6,000,000
Preferred stock	$ 300	$ 300
Preferred stock, stated value per share (in dollars per share)	$ 50
Preferred stock, annual dividend rate	5.375%
Series L
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	7,000,000	7,000,000
Preferred stock	$ 345	$ 345
Preferred stock, stated value per share (in dollars per share)	$ 50
Preferred stock, annual dividend rate	5.125%
Series M
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	9,000,000	9,000,000
Preferred stock	$ 460	$ 460
Preferred stock, stated value per share (in dollars per share)	$ 50
Preferred stock, annual dividend rate	4.75%
Series N
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	5,000,000	5,000,000
Preferred stock	$ 225	$ 225
Preferred stock, stated value per share (in dollars per share)	$ 50
Preferred stock, annual dividend rate	5.50%
Series O
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	50,000,000	50,000,000
Preferred stock	$ 2,500	$ 2,500
Preferred stock, stated value per share (in dollars per share)	$ 50
Preferred stock, annual dividend rate	7.00%
Convertible Series 2004-1
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	24,922	24,922
Preferred stock	$ 2,492	$ 2,492
Preferred stock, stated value per share (in dollars per share)	$ 100,000
Preferred stock, annual dividend rate	5.375%
Preferred stock, shares outstanding (in shares)	24,922	24,922
Series P
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	40,000,000	40,000,000
Preferred stock	$ 1,000	$ 1,000
Preferred stock, stated value per share (in dollars per share)	$ 25
Preferred stock, annual dividend rate	6.342%
Preferred stock dividend rate, basis spread on variable rate	0.75%
Series Q
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	15,000,000	15,000,000
Preferred stock	$ 375	$ 375
Preferred stock, stated value per share (in dollars per share)	$ 25
Preferred stock, annual dividend rate	6.75%
Series R
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	21,000,000	21,000,000				1,200,000	20,000,000
Preferred stock	$ 530	$ 530				$ 30	$ 500
Preferred stock, stated value per share (in dollars per share)	$ 25
Preferred stock, annual dividend rate	7.625%
Series S
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	280,000,000	280,000,000
Preferred stock	$ 7,000	$ 7,000
Preferred stock, stated value per share (in dollars per share)	$ 25
Preferred stock, annual dividend rate	9.822%
Preferred stock dividend rate, basis spread on variable rate	4.23%
Preferred stock, redemption terms	five years
Series T
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	89,000,000	89,000,000	1,000,000	8,000,000	80,000,000
Preferred stock	$ 2,225	$ 2,225		$ 200	$ 2,000
Preferred stock, stated value per share (in dollars per share)	$ 25
Preferred stock, annual dividend rate	8.25%
Liquidation preference			$ 25
Maximum | Series F
Class of Stock [Line Items]
Preferred stock, annual dividend rate	11.00%
Maximum | Series G
Class of Stock [Line Items]
Preferred stock, annual dividend rate	11.00%
Minimum | Series O
Class of Stock [Line Items]
Preferred stock, annual dividend rate	7.00%
Minimum | Series P
Class of Stock [Line Items]
Preferred stock dividend rate, basis spread on variable rate	4.50%
Minimum | Series S
Class of Stock [Line Items]
Preferred stock, annual dividend rate	7.75%
Two-year Constant Maturity U.S. Treasury Rate | Series F
Class of Stock [Line Items]
Preferred stock dividend rate, basis spread on variable rate	0.16%
Two-year Constant Maturity U.S. Treasury Rate | Series G
Class of Stock [Line Items]
Preferred stock dividend rate, basis spread on variable rate	0.18%
Ten-year Constant Maturity U.S. Treasury Rate | Series O
Class of Stock [Line Items]
Preferred stock dividend rate, basis spread on variable rate	2.375%
Secured Overnight Financing Rate (SOFR) | Series P
Class of Stock [Line Items]
Preferred stock dividend rate, basis spread on variable rate	0.26161%
Secured Overnight Financing Rate (SOFR) | Series S
Class of Stock [Line Items]
Preferred stock dividend rate, basis spread on variable rate	0.26161%
Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	556,000,000	556,000,000