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Available-for-Sale Debt Securities - Summary of Available-for-Sale Debt Securities at Estimated Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Available-for-Sale Debt Securities
Amortized Cost	$ 14,952	$ 16,499
Gross Unrealized Gains	27	2
Gross Unrealized Losses	(59)	(1)
Available-for-sale debt securities	14,920	16,500
U.S. treasury securities
Available-for-Sale Debt Securities
Amortized Cost	2,048	2,433
Gross Unrealized Gains	24	0
Gross Unrealized Losses	0	0
Available-for-sale debt securities	2,072	2,433
Certificates of deposit
Available-for-Sale Debt Securities
Amortized Cost	3,201	3,517
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Available-for-sale debt securities	3,201	3,517
U.S. government agencies securities
Available-for-Sale Debt Securities
Amortized Cost	134	1,081
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Available-for-sale debt securities	134	1,081
Non-U.S. government securities
Available-for-Sale Debt Securities
Amortized Cost	22	174
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Available-for-sale debt securities	22	174
Corporate debt securities
Available-for-Sale Debt Securities
Amortized Cost	9,287	9,203
Gross Unrealized Gains	3	2
Gross Unrealized Losses	(55)	(1)
Available-for-sale debt securities	9,235	9,204
Residential mortgage and asset-backed securities
Available-for-Sale Debt Securities
Amortized Cost	260	91
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(4)	0
Available-for-sale debt securities	$ 256	$ 91

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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