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Debt - Letters of Credit, Borrowings and Repayments (Details)	1 Months Ended	9 Months Ended
	Aug. 31, 2018 USD ($) debt_instrument	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Debt
Outstanding letters of credit		$ 181,000,000		$ 166,000,000
Credit facilities and commercial paper program
Debt
Total borrowings		38,600,000,000	$ 52,600,000,000
Total repayments		$ 39,200,000,000	$ 52,700,000,000
Term loan | GO Zone term loans
Debt
Number of debt instruments | debt_instrument	2
Term loan | GO Zone term loan 1
Debt
Debt instrument face value	$ 100,000,000
Term loan | GO Zone term loan 2
Debt
Debt instrument face value	$ 100,000,000
Credit facility | Senior unsecured revolving credit facility
Debt
Maturity extension	1 year
Expired borrowing capacity	$ 1,000,000,000.0

X

- Definition

Debt, Maturity Extension, Length Of Extension

+ References

No definition available.

+ Details

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- Definition

Debt, Number Of Instruments

+ References

No definition available.

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- Definition

Line of Credit Facility, Maximum Borrowing Capacity, Expired Capacity

+ References

No definition available.

+ Details

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X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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X

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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X

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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