Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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Investments - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
Investments - Narrative (Details) - USD ($) $ in Millions	Jul. 18, 2019	Jun. 30, 2018	Jun. 30, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Investment securities in a continuous unrealized loss positionfor less then 12 months			$ 1,300	$ 2,900
Investment securities in a continuous loss position for less than 12 months, unrealized losses			0	0
Estimated fair value for securities in continuous unrealized loss position for greater than 12 months			1,500	2,700
Investment securities in a continuous loss position for greater than 12 months, unrealized losses			$ 0	$ 41
Gain on relinquishment of investment		$ 266
Paytm Mall \| Subsequent Event
Subsequent Event [Line Items]
Cash investment to acquire ownership interest	$ 160