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Fair Value Measurements - Summary of Available-for-sale Securities Portfolio (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

12 Months Ended

Jun. 30, 2018

Jun. 30, 2017

Jun. 30, 2018

Jun. 30, 2017

Sep. 30, 2017

Schedule of Available-for-sale Securities [Line Items]

Original cost

$ 335

$ 335

$ 335

Accumulated adjustments, net

(38)

(38)

(24)

Adjusted cost

^[1]

297

297

311

Investment income

2

$ 2

6

^[2]

$ 7

9

^[2]

Net unrealized gain

42

42

35

Realized gains

0

0

4

2

2

Settlement funds

10

2

Disbursements

(7)

$ (7)

(25)

$ (19)

(27)

Fair value

334

334

332

Available-for-sale Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Adjusted cost

292

292

297

Fair value

334

334

332

Unrealized gain

47

47

35

Unrealized loss

(5)

(5)

0

Corporate bond mutual fund [Member]

Schedule of Available-for-sale Securities [Line Items]

Adjusted cost

120

120

120

Corporate bond mutual fund, unrealized gain

0

0

1

Corporate bond mutual fund, unrealized loss

(5)

(5)

0

Corporate bond mutual fund, Fair value

115

115

121

Equity mutual fund [Member]

Schedule of Available-for-sale Securities [Line Items]

Adjusted cost

154

154

168

Equity mutual fund, unrealized gain

47

47

34

Equity mutual fund, unrealized loss

0

0

0

Equity mutual fund, Fair value

201

201

202

Demand Deposits [Member]

Schedule of Available-for-sale Securities [Line Items]

Demand deposit

$ 18

$ 18

$ 9

[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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