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DEBT - Notes and Debentures (Details) - USD ($) $ in Millions					3 Months Ended	12 Months Ended
	Apr. 16, 2018	Jun. 27, 2017	Jun. 21, 2017	Mar. 17, 2016	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Apr. 15, 2016
Debt
Repayments of notes payable						$ 114	$ 535	$ 1,300
Proceeds from issuance of debt			$ 599	$ 896
Debt extinguishment costs						0	104	40
Debt extinguishment costs					$ 104	$ 0	104	$ 40
6.625% Notes and Debentures Due 15 April 2018
Debt
Interest rate (as a percent)	6.625%
Repayments of notes payable	$ 114
6.625% Notes and Debentures Due 15 April 2018 | Senior notes and debentures
Debt
Interest rate (as a percent)						6.625%
Senior Notes					$ 114	$ 0	$ 114
7.75% Notes and Debentures Due 1 August 2029 | Senior notes and debentures
Debt
Interest rate (as a percent)		7.75%			7.75%	7.75%	7.75%
Repayments of notes payable		$ 62
Senior Notes					$ 234	$ 235	$ 234
3.5% Notes and Debentures Due November 15, 2027
Debt
Interest rate (as a percent)						3.50%
3.5% Notes and Debentures Due November 15, 2027 | Senior notes and debentures
Debt
Interest rate (as a percent)			3.50%
Long-term debt, gross			$ 300
Senior Notes					300	$ 300	300
4.5% Notes and Debentures Due May 15, 2047 | Senior notes and debentures
Debt
Interest rate (as a percent)			4.50%			4.50%
Long-term debt, gross			$ 300
Senior Notes					299	$ 299	299
7.125% Notes and Debentures Due 15 March 2020 | Senior notes and debentures
Debt
Interest rate (as a percent)		7.125%				7.125%
Repayments of notes payable		$ 299
Senior Notes					201	$ 201	201
5.95% Notes and Debentures Due March 15, 2022 [Member] | Senior notes and debentures
Debt
Interest rate (as a percent)		5.95%
Repayments of notes payable		$ 74
6.5% Notes and Debentures Due 15 August 2032 | Senior notes and debentures
Debt
Interest rate (as a percent)		6.50%				6.50%
Repayments of notes payable		$ 100
Senior Notes					200	$ 200	200
7.125%, 5.95%, 7.75% and 6.5% Notes and Debentures [Member]
Debt
Debt extinguishment costs						$ 107
3.5% Notes and Debentures Due April 1, 2021
Debt
Interest rate (as a percent)						3.50%
3.5% Notes and Debentures Due April 1, 2021 | Senior notes and debentures
Debt
Interest rate (as a percent)				3.50%
Long-term debt, gross				$ 400
Senior Notes					399	$ 399	399
4.375% Notes and Debentures Due April 1, 2026
Debt
Interest rate (as a percent)						4.375%
4.375% Notes and Debentures Due April 1, 2026 | Senior notes and debentures
Debt
Interest rate (as a percent)				4.375%
Long-term debt, gross				$ 500
Senior Notes					498	$ 498	498
6.125% Notes and Debentures Due October 3, 2016 | Senior notes and debentures
Debt
Interest rate (as a percent)									6.125%
Senior Notes									$ 1,000
5.85% Notes and Debenture Due March 15, 2017 | Senior notes and debentures
Debt
Interest rate (as a percent)									5.85%
Senior Notes									$ 300
4.45% Notes and Debentures Due 1 April 2025 | Senior notes and debentures
Debt
Interest rate (as a percent)						4.45%
Senior Notes					$ 500	$ 500	$ 500

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ 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(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher FASB
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-Topic 942
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

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Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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