Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Beginning balance	$ 115
Other comprehensive income (loss) before reclassifications	(91)
Amounts reclassified from AOCI	15
Total other comprehensive income (loss)	(76)	$ 93
Ending balance	39
Unrealized gains (losses) on AFS, net [Member]
Beginning balance	176
Other comprehensive income (loss) before reclassifications	(87)
Amounts reclassified from AOCI	(5)
Total other comprehensive income (loss)	(92)
Ending balance	84
Foreign currency translation, net [Member]
Beginning balance	(10)
Other comprehensive income (loss) before reclassifications	1
Amounts reclassified from AOCI	0
Total other comprehensive income (loss)	1
Ending balance	(9)
Instrument-specific credit risk of liabilities measured at fair value, net [Member]
Beginning balance	(51)
Other comprehensive income (loss) before reclassifications	(5)
Amounts reclassified from AOCI	20
Total other comprehensive income (loss)	15
Ending balance	$ (36)

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References + Details