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Condensed Consolidating Financial Statements (Narrative) (Details) - USD ($) | Dec. 31, 2015 | Aug. 18, 2015 | May. 26, 2015
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Condensed Financial Statements, Captions [Line Items] |  |  |
Ownership interest of subsidiary | 100.00% |  |
Senior notes |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt issued |  | $ 2,000,000,000.0 |
Senior notes | 4.0% Senior Notes due in 2025 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt issued |  |  | $ 700,000,000
Interest rate |  |  | 4.00%
Senior notes | 2.5% Senior Notes due in 2018 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt issued |  | $ 400,000,000 |
Interest rate |  | 2.50% |
Senior notes | 3.3% Senior Notes due in 2020 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt issued |  | $ 700,000,000 |
Interest rate |  | 3.30% |
Senior notes | 4.4% Senior Notes due in 2026 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt issued |  | $ 900,000,000 |
Interest rate |  | 4.40% |

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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