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Fair Value Measurements - Investments Held in Trusts (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Short-term cash investments	$ 753	$ 751
Short-term cash investments held for sale	751	747
Debt securities held for sale	124	135
Debt securities
Debt Securities, Available-for-sale [Line Items]
Cost Basis	405	403
Unrealized Gains	8	9
Unrealized Losses	(16)	(11)
Fair Value	$ 397	$ 401

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Cash and Cash Equivalents, Held-for-Sale, Fair Value Disclosure

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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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