Total Equity - Components of Period Changes in OCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
After-tax Gain (Loss)
Net OCI	$ (209)	$ 232	$ (2,044)	$ (621)
Foreign Currency Translation Adjustment Attributable to Parent
After-tax Gain (Loss)
OCI activity	(235)	41	(283)	(100)
Reclassified to earnings	59	0	59	0
Net OCI	(176)	41	(224)	(100)
Foreign Currency Translation Adjustment Including Noncontrolling Interest
Pre-tax Gain (Loss)
OCI activity	(134)	12	(194)	(92)
Reclassified to earnings	0	0	0	0
Net OCI	(134)	12	(194)	(92)
Income Tax Benefit (Provision)
OCI activity	(213)	29	(258)	(86)
Reclassified to earnings	59	0	59	0
Net OCI	(154)	29	(199)	(86)
After-tax Gain (Loss)
OCI activity	(347)	41	(452)	(178)
Reclassified to earnings	59	0	59	0
Net OCI	(288)	41	(393)	(178)
Foreign Currency Translation Adjustment Attributable to Noncontrolling Interest
After-tax Gain (Loss)
OCI activity	(112)	0	(169)	(78)
Reclassified to earnings	0	0	0	0
Net OCI	(112)	0	(169)	(78)
Change in Net Unrealized Gains (Losses) on AFS Securities Attributable to Parent
After-tax Gain (Loss)
OCI activity	(1,062)	37	(3,424)	(636)
Reclassified to earnings	(14)	(44)	(47)	(147)
Net OCI	(1,076)	(7)	(3,471)	(783)
Change in Net Unrealized Gains (Losses) on AFS Securities Including Noncontrolling Interest
Pre-tax Gain (Loss)
OCI activity	(1,387)	47	(4,471)	(829)
Reclassified to earnings	(18)	(58)	(62)	(192)
Net OCI	(1,405)	(11)	(4,533)	(1,021)
Income Tax Benefit (Provision)
OCI activity	325	(10)	1,047	193
Reclassified to earnings	4	14	15	45
Net OCI	329	4	1,062	238
After-tax Gain (Loss)
OCI activity	(1,062)	37	(3,424)	(636)
Reclassified to earnings	(14)	(44)	(47)	(147)
Net OCI	(1,076)	(7)	(3,471)	(783)
Change in Net Unrealized Gains (Losses) on AFS Securities Attributable to Noncontrolling Interest
After-tax Gain (Loss)
OCI activity	0	0	0	0
Reclassified to earnings	0	0	0	0
Net OCI	0	0	0	0
Pension, Postretirement and Other Attributable to Parent
After-tax Gain (Loss)
OCI activity	(2)	8	(2)	8
Reclassified to earnings	5	4	10	9
Net OCI	3	12	8	17
Pension, Postretirement and Other Including Noncontrolling Interest
Pre-tax Gain (Loss)
OCI activity	(2)	8	(2)	8
Reclassified to earnings	6	7	11	14
Net OCI	4	15	9	22
Income Tax Benefit (Provision)
OCI activity	0	0	0	0
Reclassified to earnings	(1)	(3)	(1)	(5)
Net OCI	(1)	(3)	(1)	(5)
After-tax Gain (Loss)
OCI activity	(2)	8	(2)	8
Reclassified to earnings	5	4	10	9
Net OCI	3	12	8	17
Pension, Postretirement and Other Attributable to Noncontrolling Interest
After-tax Gain (Loss)
OCI activity	0	0	0	0
Reclassified to earnings	0	0	0	0
Net OCI	0	0	0	0
Change in Net DVA Attributable to Parent
After-tax Gain (Loss)
OCI activity	1,131	177	1,769	284
Reclassified to earnings	(1)	8	(1)	21
Net OCI	1,130	185	1,768	305
Change in Net DVA Including Noncontrolling Interest
Pre-tax Gain (Loss)
OCI activity	1,521	237	2,392	404
Reclassified to earnings	(1)	10	(1)	27
Net OCI	1,520	247	2,391	431
Income Tax Benefit (Provision)
OCI activity	(368)	(59)	(579)	(102)
Reclassified to earnings	0	(2)	0	(6)
Net OCI	(368)	(61)	(579)	(108)
After-tax Gain (Loss)
OCI activity	1,153	178	1,813	302
Reclassified to earnings	(1)	8	(1)	21
Net OCI	1,152	186	1,812	323
Change in Net DVA Attributable to Noncontrolling Interest
After-tax Gain (Loss)
OCI activity	22	1	44	18
Reclassified to earnings	0	0	0	0
Net OCI	$ 22	$ 1	$ 44	$ 18