Netting Arrangements (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Assets:
Derivative assets, gross amount	$ 1,930	$ 408
Derivative assets, gross amount offset	(109)	(237)
Derivative assets, net amount presented in our condensed consolidated balance sheets	1,821	171
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	(631)	(133)
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	0	0
Derivative assets, net amount	1,190	38
Securities purchased under agreements to resell or similar arrangements, gross amount	55,232	64,843
Securities purchased under agreements to resell or similar arrangements, gross amount offset	0	0
Securities purchased under agreements to resell or similar arrangements, under master netting arrangements,	55,232	64,843
Securities purchased under agreements to resell or similar arrangements, under master netting arrangements, amounts not offset in our condensed 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 condensed consolidated balance sheets, collateral	(55,232)	(64,843)
Securities purchased under agreements to resell or similar arrangements, net amount	0	0
Total assets, gross amount	57,162	65,251
Total assets, gross amount offset	(109)	(237)
Total assets, net amount presented in our condensed consolidated balance sheets	57,053	65,014
Total assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	(631)	(133)
Total assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	(55,232)	(64,843)
Total assets, net amount	1,190	38
Liabilities:
Total liabilities, gross amount	(4,057)	(1,385)
Total liabilities, gross amount offset	2,881	1,173
Total liabilities, net amount presented in our condensed consolidated balance sheets	(1,176)	(212)
Total liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	631	133
Total liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	40	66
Total liabilities, net amount	(505)	(13)
Mortgage commitment derivatives
Assets:
Derivative assets, gross amount	1,739	169
Derivative assets, gross amount offset	0	0
Derivative assets, net amount presented in our condensed consolidated balance sheets	1,739	169
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	(631)	(133)
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	0	0
Derivative assets, net amount	1,108	36
Liabilities:
Derivative liabilities, gross amount	(1,141)	(197)
Derivative liabilities, gross amount offset	0	0
Derivative liabilities, net amount presented in our condensed consolidated balance sheets	(1,141)	(197)
Derivative liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments	631	133
Derivative liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral	5	56
Derivative liabilities, net amount	(505)	(8)
Over the Counter | Risk Management Derivatives
Assets:
Derivative assets, gross amount	191	239
Derivative assets, gross amount offset	(111)	(237)
Derivative assets, net amount presented in our condensed consolidated balance sheets	80	2
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	80	2
Liabilities:
Derivative liabilities, gross amount	(2,916)	(1,188)
Derivative liabilities, gross amount offset	2,916	1,183
Derivative liabilities, net amount presented in our condensed consolidated balance sheets	0	(5)
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	(5)
Exchange Cleared | Risk Management Derivatives
Assets:
Derivative assets, gross amount	0	0
Derivative assets, gross amount offset	2	0
Derivative assets, net amount presented in our condensed consolidated balance sheets	2	0
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	2	0
Liabilities:
Derivative liabilities, gross amount	0	0
Derivative liabilities, gross amount offset	(35)	(10)
Derivative liabilities, net amount presented in our condensed consolidated balance sheets	(35)	(10)
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	35	10
Derivative liabilities, net amount	$ 0	$ 0