Total Equity - Components of Period Changes in OCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
After-tax Gain (Loss)
Total other comprehensive income (loss)	$ (1,230)	$ 868	$ (565)
Foreign Currency Translation Adjustment Attributable to Parent
After-tax Gain (Loss)
OCI activity	(207)	105	(8)
Reclassified to earnings	0	(3)	0
Total other comprehensive income (loss)	(207)	102	(8)
Foreign Currency Translation Adjustment Including Noncontrolling Interest
Pre-tax Gain (Loss)
OCI activity	(140)	74	6
Reclassified to earnings	0	(3)	0
Net OCI	(140)	71	6
Income Tax Benefit (Provision)
OCI activity	(191)	99	(3)
Reclassified to earnings	0	0	0
Net OCI	(191)	99	(3)
After-tax Gain (Loss)
OCI activity	(331)	173	3
Reclassified to earnings	0	(3)	0
Total other comprehensive income (loss)	(331)	170	3
Foreign Currency Translation Adjustment Attributable to Noncontrolling Interest
After-tax Gain (Loss)
OCI activity	(124)	68	11
Reclassified to earnings	0	0	0
Total other comprehensive income (loss)	(124)	68	11
Change in Net Unrealized Gains (Losses) on AFS Securities Attributable to Parent
After-tax Gain (Loss)
OCI activity	(1,381)	1,686	1,215
Reclassified to earnings	(161)	(106)	(78)
Total other comprehensive income (loss)	(1,542)	1,580	1,137
Change in Net Unrealized Gains (Losses) on AFS Securities Including Noncontrolling Interest
Pre-tax Gain (Loss)
OCI activity	(1,803)	2,194	1,588
Reclassified to earnings	(210)	(137)	(103)
Net OCI	(2,013)	2,057	1,485
Income Tax Benefit (Provision)
OCI activity	422	(508)	(373)
Reclassified to earnings	49	31	25
Net OCI	471	(477)	(348)
After-tax Gain (Loss)
OCI activity	(1,381)	1,686	1,215
Reclassified to earnings	(161)	(106)	(78)
Total other comprehensive income (loss)	(1,542)	1,580	1,137
Change in Net Unrealized Gains (Losses) on AFS Securities Attributable to Noncontrolling Interest
After-tax Gain (Loss)
OCI activity	0	0	0
Reclassified to earnings	0	0	0
Total other comprehensive income (loss)	0	0	0
Pension and Other Attributable to Parent
After-tax Gain (Loss)
OCI activity	(75)	128	(73)
Reclassified to earnings	22	18	7
Total other comprehensive income (loss)	(53)	146	(66)
Pension and Other Including Noncontrolling Interest
Pre-tax Gain (Loss)
OCI activity	(101)	162	(98)
Reclassified to earnings	31	23	12
Net OCI	(70)	185	(86)
Income Tax Benefit (Provision)
OCI activity	26	(34)	25
Reclassified to earnings	(9)	(5)	(5)
Net OCI	17	(39)	20
After-tax Gain (Loss)
OCI activity	(75)	128	(73)
Reclassified to earnings	22	18	7
Total other comprehensive income (loss)	(53)	146	(66)
Pension and Other Attributable to Noncontrolling Interest
After-tax Gain (Loss)
OCI activity	0	0	0
Reclassified to earnings	0	0	0
Total other comprehensive income (loss)	0	0	0
Change in Net DVA Attributable to Parent
After-tax Gain (Loss)
OCI activity	635	(1,022)	(1,568)
Reclassified to earnings	27	20	9
Total other comprehensive income (loss)	662	(1,002)	(1,559)
Change in Net DVA Including Noncontrolling Interest
Pre-tax Gain (Loss)
OCI activity	882	(1,385)	(2,181)
Reclassified to earnings	36	26	11
Net OCI	918	(1,359)	(2,170)
Income Tax Benefit (Provision)
OCI activity	(213)	337	533
Reclassified to earnings	(9)	(6)	(2)
Net OCI	(222)	331	531
After-tax Gain (Loss)
OCI activity	669	(1,048)	(1,648)
Reclassified to earnings	27	20	9
Total other comprehensive income (loss)	696	(1,028)	(1,639)
Change in Net DVA Attributable to Noncontrolling Interest
After-tax Gain (Loss)
OCI activity	34	(26)	(80)
Reclassified to earnings	0	0	0
Total other comprehensive income (loss)	$ 34	$ (26)	$ (80)