Netting Arrangements (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Assets:
Derivative assets, gross amount	$ 390	$ 513
Derivative assets, gross amount offset	(277)	(362)
Derivative assets, net amount presented in our condensed consolidated balance sheets	113	151
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	(38)	(91)
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	(18)	(14)
Derivative assets, net amount	57	46
Securities purchased under agreements to resell, gross amount	61,525	56,250
Securities purchased under agreements to resell, gross amount offset	0	0
Securities purchased under agreements to resell, under master netting arrangements	61,525	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	(61,525)	(56,250)
Securities purchased under agreements to resell, net amount	0	0
Total assets, gross amount	61,915	56,763
Total assets, gross amount offset	(277)	(362)
Total assets, net amount presented in our condensed consolidated balance sheets	61,638	56,401
Total assets, under the master netting arrangements, not offset in our consolidated balance sheets, financial instruments	(38)	(91)
Total assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	(61,543)	(56,264)
Total assets, net amount	57	46
Liabilities:
Total liabilities, gross amount	(1,494)	(2,505)
Total liabilities, gross amount offset	1,324	2,367
Total liabilities, net amount presented in our condensed consolidated balance sheets	(170)	(138)
Total liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	38	91
Total liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	114	10
Total liabilities, net amount	(18)	(37)
Derivative assets not subject to enforceable master netting arrangements	31	28
Derivative liabilities not subject to enforceable master netting arrangements	(9)	(16)
Mortgage commitment derivatives
Assets:
Derivative assets, gross amount	62	112
Derivative assets, gross amount offset	0	0
Derivative assets, net amount presented in our condensed consolidated balance sheets	62	112
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	(38)	(91)
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	(2)	(14)
Derivative assets, net amount	22	7
Liabilities:
Derivative liabilities, gross amount	(156)	(137)
Derivative liabilities, gross amount offset	0	0
Derivative liabilities, net amount presented in our condensed consolidated balance sheets	(156)	(137)
Derivative liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	38	91
Derivative liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	102	9
Derivative liabilities, net amount	(16)	(37)
OTC risk management derivatives | Risk Management Derivatives
Assets:
Derivative assets, gross amount	328	401
Derivative assets, gross amount offset	(280)	(383)
Derivative assets, net amount presented in our condensed consolidated balance sheets	48	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	(16)	0
Derivative assets, net amount	32	18
Liabilities:
Derivative liabilities, gross amount	(1,338)	(2,368)
Derivative liabilities, gross amount offset	1,336	2,368
Derivative liabilities, net amount presented in our condensed consolidated balance sheets	(2)	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	(2)	0
Cleared risk management derivatives | Risk Management Derivatives
Assets:
Derivative assets, gross amount	0	0
Derivative assets, gross amount offset	3	21
Derivative assets, net amount presented in our condensed consolidated balance sheets	3	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	3	21
Liabilities:
Derivative liabilities, gross amount	0	0
Derivative liabilities, gross amount offset	(12)	(1)
Derivative liabilities, net amount presented in our condensed consolidated balance sheets	(12)	(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	12	1
Derivative liabilities, net amount	$ 0	$ 0