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Fair Value Measurements - Summary of Investment Portfolio (Details) - USD ($)
$ in Millions

3 Months Ended

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Original cost

$ 335

$ 335

Accumulated adjustments, net

(47)

(38)

Adjusted cost

^[1]

288

297

Investment income

3

^[2]

$ 2

8

^[2]

Net unrealized gain

24

54

Realized gains

0

6

Settlement funds

2

10

Disbursements

(8)

$ (5)

(33)

Fair value

$ 309

$ 342

[1]	The accumulated adjustments include investment income, realized gains, disbursements and settlements recorded in previous periods.
[2]	Investment income for the demand deposit includes interest income as well as dividend income transferred from the equity and corporate bond mutual funds.

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Amount of accumulated investment income, realized gains, disbursements and settlements recorded in previous periods.

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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Amount of 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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-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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Amount of unrealized gain (loss) on investment in debt and equity securities.

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Amount of realized gain (loss) 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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-Publisher FASB
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Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities.

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