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Debt - Schedule of Debt (Details) - USD ($) | Jun. 30, 2017 | Dec. 31, 2016 | Sep. 22, 2016 | May 26, 2015
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total debt | $ 3,566,000,000 | $ 3,564,000,000 |  |
Less: short-term debt including current maturities | 0 | 0 |  |
Long-term debt | 3,566,000,000 | 3,564,000,000 |  |
Commercial paper | Five-Year Credit Agreement |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt | $ 0 | 0 |  |
Senior notes | 2.5% Senior Notes, due 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 2.50% |  |  |
Long-term debt | $ 399,000,000 | 398,000,000 |  |
Unamortized debt discount and issuance costs | $ 1,000,000 |  |  |
Senior notes | 3.3% Senior Notes, due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 3.30% |  |  |
Long-term debt | $ 696,000,000 | 696,000,000 |  |
Unamortized debt discount and issuance costs | $ 4,000,000 |  |  |
Senior notes | 4.0% Senior Notes, due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.00% |  |  | 4.00%
Long-term debt | $ 691,000,000 | 691,000,000 |  |
Unamortized debt discount and issuance costs | $ 9,000,000 |  |  |
Senior notes | 4.4% Senior Notes, due 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.40% |  |  |
Long-term debt | $ 892,000,000 | 891,000,000 |  |
Unamortized debt discount and issuance costs | $ 8,000,000 |  |  |
Senior notes | 2.95% Senior Notes, due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 2.95% |  | 2.95% |
Long-term debt | $ 492,000,000 | 492,000,000 |  |
Unamortized debt discount and issuance costs | $ 8,000,000 |  |  |
Senior notes | 6.55% Senior Notes, due 2037 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 6.55% |  |  |
Long-term debt | $ 396,000,000 | $ 396,000,000 |  |
Unamortized debt discount and issuance costs | $ 4,000,000 |  |  |

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- 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 + Details
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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 + Details
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- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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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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