Outstanding Exposure - Amortization Schedule of Puerto Rico Net Par Outstanding and Net Debt Service Outstanding (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Scheduled Net Par Amortization
Total	$ 235,668	$ 234,153
Scheduled Net Debt Service Amortization
Total	366,373	366,233
Puerto Rico
Scheduled Net Par Amortization
2021 (October 1 - December 31)	0
2022 (January 1 - March 31)	0
2022 (April 1 - June 30)	0
2022 (July 1 - September 30)	176
2022 (October 1 - December 31)	0
Subtotal 2022	176
2023	206
2024	222
2025	223
2026-2030	987
2031-2035	1,205
2036-2040	504
2041-2042	49
Total	3,572	$ 3,725
Scheduled Net Debt Service Amortization
2021 (October 1 - December 31)	3
2022 (January 1 - March 31)	88
2022 (April 1 - June 30)	2
2022 (July 1 - September 30)	263
2022 (October 1 - December 31)	3
Subtotal 2022	356
2023	378
2024	383
2025	373
2026-2030	1,575
2031-2035	1,557
2036-2040	576
2041-2042	51
Total	$ 5,252