Redeemable Preferred Securities of Subsidiaries

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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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
-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

Date the debt instrument was issued, in CCYY-MM-DD format.

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

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- 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.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ 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(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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

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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

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

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- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

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- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Debt and Redeemable Preferred Securities of Subsidiaries (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Mar. 31, 2015	Jun. 30, 2014
Debt Instrument
Scheduled maturity of long-term debt in 2017	$ 965
Scheduled maturity of long-term debt in 2018	936
Scheduled maturity of long-term debt in 2019	711
Scheduled maturity of long-term debt in 2020	757
Scheduled maturity of long-term debt in 2021	249
Redeemable Preferred Securities of Subsidiaries	58	$ 64	$ 500
Expiring 2021
Debt Instrument
Revolving credit facility	$ 2,000
Expiration date of revolving credit facility	Jun. 30, 2021
Dealer Remarketable Securities
Debt Instrument
Debt Instrument, Repurchase Amount		$ 200
3.20% Notes due July 30, 2046
Debt Instrument
Debt issuance date	Jul. 29, 2016
Face amount of note				$ 500
Debt maturity date	Jul. 30, 2046
Interest rate of note				3.20%
1.40% Notes due February 15, 2019
Debt Instrument
Debt issuance date	Feb. 22, 2016
Face amount of note					$ 400
Debt maturity date	Feb. 15, 2019
Interest rate of note						1.40%
2.75% Notes due February 15, 2026
Debt Instrument
Face amount of note					$ 400
Debt maturity date	Feb. 15, 2026
Interest rate of note					2.75%
2.15% Notes due August 15, 2020
Debt Instrument
Debt issuance date		Aug. 01, 2015
Face amount of note						$ 250
Debt maturity date		Aug. 15, 2020
Interest rate of note						2.15%
3.05% Notes due August 15, 2025
Debt Instrument
Face amount of note						$ 300
Debt maturity date		Aug. 15, 2025
Interest rate of note						3.05%
Notes due August 2015
Debt Instrument
Face amount of note						$ 300
1.85% Notes due March 1, 2020
Debt Instrument
Debt issuance date		Feb. 01, 2015
Face amount of note							$ 250
Debt maturity date		Mar. 01, 2020
Interest rate of note							1.85%
2.65% Notes due March 1, 2025
Debt Instrument
Face amount of note							$ 250
Debt maturity date		Mar. 01, 2025
Interest rate of note							2.65%
Aggregate principle amount due October 15, 2022
Debt Instrument
Debt issuance date			Oct. 17, 2014
Health Care Spin-off
Debt Instrument
Face amount of note			$ 640
Floating rate note due May 19, 2016
Debt Instrument
Debt issuance date			May 22, 2014
Face amount of note								$ 300
Debt maturity date			May 19, 2016
1.9% Notes due May 22, 2019
Debt Instrument
Face amount of note								$ 300
Debt maturity date			May 22, 2019
Interest rate of note								1.90%