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.

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

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Amount, after accumulated amortization, of debt discount.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Debt Instrument, Purchase Price Percent Due to Downgrade of Investment Grade

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Financial Instruments - Senior Notes Offering and Other Long-Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Oct. 31, 2017	Sep. 12, 2017	Nov. 13, 2015	Jan. 28, 2013
Debt Instrument [Line Items]
Debt, principal amount	$ 5,000	$ 5,000
Senior Notes [Member]
Debt Instrument [Line Items]
Debt, principal amount				$ 1,250	$ 1,250	$ 3,650
Debt, unamortized discount				$ 7	$ 2	$ 10
Debt, purchase price percent due to downgrade of investment grade						101.00%
Senior Notes [Member] \| 3.000% 2017 senior notes due 2027
Debt Instrument [Line Items]
Debt, principal amount	750	750
Interest rate percentage				3.00%
Senior Notes [Member] \| 3.950% 2017 senior notes due 2047
Debt Instrument [Line Items]
Debt, principal amount	$ 500	$ 500
Interest rate percentage				3.95%
Senior Notes [Member] \| Senior Notes Due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt current portion			$ 750
Interest rate percentage						1.875%