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Debt - Fair Value, Activity, Letters of Credit, Borrowings and Repayments (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Jan. 31, 2017	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Debt
Short-term debt		$ 1,114		$ 1,715
Repayments of senior notes		400
Letters of credit
Debt
Outstanding letters of credit		105		73
Senior notes
Debt
Debt instrument face value		9,900		$ 10,300
Senior notes | 6.13% senior notes due January 2016
Debt
Repayments of senior notes	$ 400
Debt instrument, interest rate	6.13%			6.13%
Senior notes | 6.50% senior notes due May 2018
Debt
Debt instrument face value		$ 600
Debt instrument, interest rate		6.50%
Senior notes | Level 2
Debt
Debt instrument fair value		$ 10,100		$ 10,400
Credit facilities and commercial paper program
Debt
Total borrowings		36,800	$ 23,000
Total repayments		37,200	$ 23,600
Exchange Traded
Debt
Short-term debt		$ 12		$ 410

X

- Definition

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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-Section 45
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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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

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- Definition

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

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

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- Definition

The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
-Paragraph 15
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