Netting Arrangements (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Assets:
Derivative assets, gross amount	$ 440,000,000	$ 326,000,000
Derivative asset, gross amount offset	(283,000,000)	(154,000,000)
Derivative assets, net amount presented in our consolidated balance sheets	157,000,000	172,000,000
Derivative assets, under master netting arrangements, amounts not offset in our consolidated balance sheets, financial instruments	(23,000,000)	(50,000,000)
Derivative assets, under master netting arrangements, amounts not offset in our consolidated balance sheets, collateral	(9,000,000)	(12,000,000)
Derivative assets, net amount	125,000,000	110,000,000
Securities purchased under agreements to resell, or similar arrangements, gross amount	65,425,000,000	69,415,000,000
Securities purchased under agreements to resell or similar arrangements, gross amount offset	0	0
Securities purchased under agreements to resell or similar arrangements, net amount presented in our consolidated balance sheets	65,425,000,000	69,415,000,000
Securities purchased under agreements to resell, under master netting arrangement, amounts not offset in our consolidated balance sheets, financial instruments	0	0
Securities purchased under agreements to resell or similar arrangements, under master netting arrangements, amounts not offset in our consolidated balance sheets, collateral	(65,425,000,000)	(69,415,000,000)
Securities purchased under agreements to resell or similar arrangements, net amount	0	0
Total assets, gross amount	65,865,000,000	69,741,000,000
Total assets, gross amount offset	(283,000,000)	(154,000,000)
Total assets, net amount presented in the consolidated balance sheets	65,582,000,000	69,587,000,000
Total assets, under the master netting arrangements, not offset in our consolidated balance sheets, financial instruments	(23,000,000)	(50,000,000)
Total assets, under master netting arrangements, not offset in our consolidated balance sheets, collateral	(65,434,000,000)	(69,427,000,000)
Total assets, net amount	125,000,000	110,000,000
Liabilities:
Total liabilities, gross amount	(3,327,000,000)	(4,764,000,000)
Total liabilities, gross amount offset	3,200,000,000	4,662,000,000
Total liabilities, net amount presented in our consolidated balance sheets	(127,000,000)	(102,000,000)
Total liabilities, under master netting arrangements, amounts not offset in our consolidated balance sheets, financial statements	23,000,000	50,000,000
Total liabilities, under master netting arrangements, amounts not offset in our consolidated balance sheets, collateral	80,000,000	7,000,000
Total liabilities, net amount	(24,000,000)	(45,000,000)
Securities received as collateral	65,500,000,000	69,500,000,000
Fair value of securities received as collateral that can be resold or repledged	55,400,000,000	28,700,000,000
Fair value of securities received as collateral that have been resold or repledged	0	0
Derivative asset, not subject to master netting arrangement	45,000,000	3,000,000
Derivative liability, not subject to master netting arrangement	(13,000,000)	(66,000,000)
Securities purchased under agreements to resell (includes $0 and $3,475, respectively, related to consolidated trusts)	30,700,000,000	14,565,000,000
Asset Pledged as Collateral with Right
Assets:
Total assets, under master netting arrangements, not offset in our consolidated balance sheets, collateral	(2,200,000,000)	(2,100,000,000)
Mortgage commitment derivatives
Assets:
Derivative assets, gross amount	112,000,000	89,000,000
Derivative asset, gross amount offset	0	0
Derivative assets, net amount presented in our consolidated balance sheets	112,000,000	89,000,000
Derivative assets, under master netting arrangements, amounts not offset in our consolidated balance sheets, financial instruments	(23,000,000)	(50,000,000)
Derivative assets, under master netting arrangements, amounts not offset in our consolidated balance sheets, collateral	(9,000,000)	(12,000,000)
Derivative assets, net amount	80,000,000	27,000,000
Liabilities:
Derivative liabilities, gross amount	(104,000,000)	(78,000,000)
Derivative liabilities, gross amount offset	0	0
Derivative liabilities, net amount presented in our consolidated balance sheets	(104,000,000)	(78,000,000)
Derivative liabilities, under master netting arrangements, amounts not offset in our consolidated balance sheets, financial instruments	23,000,000	50,000,000
Derivative liabilities, under master netting arrangements, amounts not offset in our consolidated balance sheets, collateral	77,000,000	7,000,000
Derivative liabilities, net amount	(4,000,000)	(21,000,000)
OTC risk management derivatives | Risk management derivatives
Assets:
Derivative assets, gross amount	328,000,000	237,000,000
Derivative asset, gross amount offset	(294,000,000)	(234,000,000)
Derivative assets, net amount presented in our consolidated balance sheets	34,000,000	3,000,000
Derivative assets, under master netting arrangements, amounts not offset in our consolidated balance sheets, financial instruments	0	0
Derivative assets, under master netting arrangements, amounts not offset in our consolidated balance sheets, collateral	0	0
Derivative assets, net amount	34,000,000	3,000,000
Liabilities:
Derivative liabilities, gross amount	(3,223,000,000)	(4,686,000,000)
Derivative liabilities, gross amount offset	3,203,000,000	4,662,000,000
Derivative liabilities, net amount presented in our consolidated balance sheets	(20,000,000)	(24,000,000)
Derivative liabilities, under master netting arrangements, amounts not offset in our consolidated balance sheets, financial instruments	0	0
Derivative liabilities, under master netting arrangements, amounts not offset in our consolidated balance sheets, collateral	0	0
Derivative liabilities, net amount	(20,000,000)	(24,000,000)
Cleared risk management derivatives | Risk management derivatives
Assets:
Derivative assets, gross amount	0	0
Derivative asset, gross amount offset	11,000,000	80,000,000
Derivative assets, net amount presented in our consolidated balance sheets	11,000,000	80,000,000
Derivative assets, under master netting arrangements, amounts not offset in our consolidated balance sheets, financial instruments	0	0
Derivative assets, under master netting arrangements, amounts not offset in our consolidated balance sheets, collateral	0	0
Derivative assets, net amount	11,000,000	80,000,000
Liabilities:
Derivative liabilities, gross amount	0	0
Derivative liabilities, gross amount offset	(3,000,000)	0
Derivative liabilities, net amount presented in our consolidated balance sheets	(3,000,000)	0
Derivative liabilities, under master netting arrangements, amounts not offset in our consolidated balance sheets, financial instruments	0	0
Derivative liabilities, under master netting arrangements, amounts not offset in our consolidated balance sheets, collateral	3,000,000	0
Derivative liabilities, net amount	0	0
Cash and Cash Equivalents
Liabilities:
Securities purchased under agreements to resell (includes $0 and $3,475, respectively, related to consolidated trusts)	21,800,000,000	45,200,000,000
Restricted Cash and Cash Equivalent
Liabilities:
Securities purchased under agreements to resell (includes $0 and $3,475, respectively, related to consolidated trusts)	$ 12,900,000,000	$ 9,700,000,000