Total Equity - Components of Period Changes in OCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
After-tax Gain (Loss)
Net OCI	$ (1,835)	$ (853)
Foreign Currency Translation Adjustment Attributable to Parent
After-tax Gain (Loss)
OCI activity	(48)	(141)
Reclassified to earnings	0	0
Net OCI	(48)	(141)
Foreign Currency Translation Adjustment Including Noncontrolling Interest
Pre-tax Gain (Loss)
OCI activity	(60)	(104)
Reclassified to earnings	0	0
Net OCI	(60)	(104)
Income Tax Benefit (Provision)
OCI activity	(45)	(115)
Reclassified to earnings	0	0
Net OCI	(45)	(115)
After-tax Gain (Loss)
OCI activity	(105)	(219)
Reclassified to earnings	0	0
Net OCI	(105)	(219)
Foreign Currency Translation Adjustment Attributable to Noncontrolling Interest
After-tax Gain (Loss)
OCI activity	(57)	(78)
Reclassified to earnings	0	0
Net OCI	(57)	(78)
Change in Net Unrealized Gains (Losses) on AFS Securities Attributable to Parent
After-tax Gain (Loss)
OCI activity	(2,361)	(673)
Reclassified to earnings	(34)	(103)
Net OCI	(2,395)	(776)
Change in Net Unrealized Gains (Losses) on AFS Securities Including Noncontrolling Interest
Pre-tax Gain (Loss)
OCI activity	(3,084)	(876)
Reclassified to earnings	(44)	(134)
Net OCI	(3,128)	(1,010)
Income Tax Benefit (Provision)
OCI activity	723	203
Reclassified to earnings	10	31
Net OCI	733	234
After-tax Gain (Loss)
OCI activity	(2,361)	(673)
Reclassified to earnings	(34)	(103)
Net OCI	(2,395)	(776)
Change in Net Unrealized Gains (Losses) on AFS Securities Attributable to Noncontrolling Interest
After-tax Gain (Loss)
OCI activity	0	0
Reclassified to earnings	0	0
Net OCI	0	0
Pension, Postretirement and Other Attributable to Parent
After-tax Gain (Loss)
OCI activity	0	0
Reclassified to earnings	5	5
Net OCI	5	5
Pension, Postretirement and Other Including Noncontrolling Interest
Pre-tax Gain (Loss)
OCI activity	0	0
Reclassified to earnings	5	7
Net OCI	5	7
Income Tax Benefit (Provision)
OCI activity	0	0
Reclassified to earnings	0	(2)
Net OCI	0	(2)
After-tax Gain (Loss)
OCI activity	0	0
Reclassified to earnings	5	5
Net OCI	5	5
Pension, Postretirement and Other Attributable to Noncontrolling Interest
After-tax Gain (Loss)
OCI activity	0	0
Reclassified to earnings	0	0
Net OCI	0	0
Change in Net DVA Attributable to Parent
After-tax Gain (Loss)
OCI activity	638	107
Reclassified to earnings	0	13
Net OCI	638	120
Change in Net DVA Including Noncontrolling Interest
Pre-tax Gain (Loss)
OCI activity	871	167
Reclassified to earnings	0	17
Net OCI	871	184
Income Tax Benefit (Provision)
OCI activity	(211)	(43)
Reclassified to earnings	0	(4)
Net OCI	(211)	(47)
After-tax Gain (Loss)
OCI activity	660	124
Reclassified to earnings	0	13
Net OCI	660	137
Change in Net DVA Attributable to Noncontrolling Interest
After-tax Gain (Loss)
OCI activity	22	17
Reclassified to earnings	0	0
Net OCI	$ 22	$ 17