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Fair Value Measurements and Investments Carrying amount and estimated fair value of debt (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Carrying Amount | $ 15,882 |  | $ 0
Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Carrying Amount | 15,882 | $ 15,900 |
Estimated Fair Value | 17,158 |  |
2017 Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Carrying Amount | 1,746 |  |
Estimated Fair Value | 1,754 |  |
2020 Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Carrying Amount | 2,988 |  |
Estimated Fair Value | 3,077 |  |
2022 Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Carrying Amount | 2,238 |  |
Estimated Fair Value | 2,359 |  |
2025 Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Carrying Amount | 3,964 |  |
Estimated Fair Value | 4,225 |  |
2035 Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Carrying Amount | 1,485 |  |
Estimated Fair Value | 1,698 |  |
2045 Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Carrying Amount | 3,461 |  |
Estimated Fair Value | $ 4,045 |  |

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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