Netting Arrangements (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Assets:
Derivative assets, gross amount	$ 502	$ 513
Derivative assets, gross amount offset	(399)	(362)
Derivative assets, net amount presented in our condensed consolidated balance sheets	103	151
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	(19)	(91)
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	(1)	(14)
Derivative assets, net amount	83	46
Securities purchased under agreements to resell, gross amount	71,494	56,250
Securities purchased under agreements to resell, gross amount offset	0	0
Securities purchased under agreements to resell, under master netting arrangements	71,494	56,250
Securities purchased under agreements to resell, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	0	0
Securities purchased under agreements to resell, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	(71,494)	(56,250)
Securities purchased under agreements to resell, net amount	0	0
Total assets, gross amount	71,996	56,763
Total assets, gross amount offset	(399)	(362)
Total assets, net amount presented in our condensed consolidated balance sheets	71,597	56,401
Total assets, under the master netting arrangements, not offset in our consolidated balance sheets, financial instruments	(19)	(91)
Total assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	(71,495)	(56,264)
Total assets, net amount	83	46
Liabilities:
Total liabilities, gross amount	(2,031)	(2,505)
Total liabilities, gross amount offset	1,893	2,367
Total liabilities, net amount presented in our condensed consolidated balance sheets	(138)	(138)
Total liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	19	91
Total liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	113	10
Total liabilities, net amount	(6)	(37)
Derivative assets not subject to enforceable master netting arrangements	24	28
Derivative liabilities not subject to enforceable master netting arrangements	(19)	(16)
Securities purchased under agreements to resell	31,769	15,975
Cash and Cash Equivalents
Liabilities:
Securities purchased under agreements to resell	25,900	25,400
Restricted Cash and Cash Equivalent
Liabilities:
Securities purchased under agreements to resell	13,800	14,900
Mortgage commitment derivatives
Assets:
Derivative assets, gross amount	52	112
Derivative assets, gross amount offset	0	0
Derivative assets, net amount presented in our condensed consolidated balance sheets	52	112
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	(19)	(91)
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	(1)	(14)
Derivative assets, net amount	32	7
Liabilities:
Derivative liabilities, gross amount	(111)	(137)
Derivative liabilities, gross amount offset	0	0
Derivative liabilities, net amount presented in our condensed consolidated balance sheets	(111)	(137)
Derivative liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	19	91
Derivative liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	86	9
Derivative liabilities, net amount	(6)	(37)
OTC risk management derivatives | Risk Management Derivatives
Assets:
Derivative assets, gross amount	450	401
Derivative assets, gross amount offset	(407)	(383)
Derivative assets, net amount presented in our condensed consolidated balance sheets	43	18
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	0	0
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	0	0
Derivative assets, net amount	43	18
Liabilities:
Derivative liabilities, gross amount	(1,920)	(2,368)
Derivative liabilities, gross amount offset	1,920	2,368
Derivative liabilities, net amount presented in our condensed consolidated balance sheets	0	0
Derivative liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	0	0
Derivative liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	0	0
Derivative liabilities, net amount	0	0
Cleared risk management derivatives | Risk Management Derivatives
Assets:
Derivative assets, gross amount	0	0
Derivative assets, gross amount offset	8	21
Derivative assets, net amount presented in our condensed consolidated balance sheets	8	21
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	0	0
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	0	0
Derivative assets, net amount	8	21
Liabilities:
Derivative liabilities, gross amount	0	0
Derivative liabilities, gross amount offset	(27)	(1)
Derivative liabilities, net amount presented in our condensed consolidated balance sheets	(27)	(1)
Derivative liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	0	0
Derivative liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	27	1
Derivative liabilities, net amount	$ 0	$ 0