Netting Arrangements (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Assets:
Derivative assets, gross amount	$ 586	$ 513
Derivative assets, gross amount offset	(403)	(362)
Derivative assets, net amount presented in our condensed consolidated balance sheets	183	151
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	(62)	(91)
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	(2)	(14)
Derivative assets, net amount	119	46
Securities purchased under agreements to resell, gross amount	63,878	56,250
Securities purchased under agreements to resell, gross amount offset	0	0
Securities purchased under agreements to resell, under master netting arrangements	63,878	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	(63,878)	(56,250)
Securities purchased under agreements to resell, net amount	0	0
Total assets, gross amount	64,464	56,763
Total assets, gross amount offset	(403)	(362)
Total assets, net amount presented in our condensed consolidated balance sheets	64,061	56,401
Total assets, under the master netting arrangements, not offset in our consolidated balance sheets, financial instruments	(62)	(91)
Total assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	(63,880)	(56,264)
Total assets, net amount	119	46
Liabilities:
Total liabilities, gross amount	(1,759)	(2,505)
Total liabilities, gross amount offset	1,480	2,367
Total liabilities, net amount presented in our condensed consolidated balance sheets	(279)	(138)
Total liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	62	91
Total liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	202	10
Total liabilities, net amount	(15)	(37)
Derivative assets not subject to enforceable master netting arrangements	22	28
Derivative liabilities not subject to enforceable master netting arrangements	(14)	(16)
Securities purchased under agreements to resell	23,753	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	14,200	14,900
Mortgage commitment derivatives
Assets:
Derivative assets, gross amount	141	112
Derivative assets, gross amount offset	0	0
Derivative assets, net amount presented in our condensed consolidated balance sheets	141	112
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	(62)	(91)
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	(2)	(14)
Derivative assets, net amount	77	7
Liabilities:
Derivative liabilities, gross amount	(192)	(137)
Derivative liabilities, gross amount offset	0	0
Derivative liabilities, net amount presented in our condensed consolidated balance sheets	(192)	(137)
Derivative liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	62	91
Derivative liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	117	9
Derivative liabilities, net amount	(13)	(37)
OTC risk management derivatives | Risk Management Derivatives
Assets:
Derivative assets, gross amount	445	401
Derivative assets, gross amount offset	(404)	(383)
Derivative assets, net amount presented in our condensed consolidated balance sheets	41	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	41	18
Liabilities:
Derivative liabilities, gross amount	(1,567)	(2,368)
Derivative liabilities, gross amount offset	1,565	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	1	21
Derivative assets, net amount presented in our condensed consolidated balance sheets	1	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	1	21
Liabilities:
Derivative liabilities, gross amount	0	0
Derivative liabilities, gross amount offset	(85)	(1)
Derivative liabilities, net amount presented in our condensed consolidated balance sheets	(85)	(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	85	1
Derivative liabilities, net amount	$ 0	$ 0