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Debt and Lines of Credit - Additional Information (Details) - USD ($) | 1 Months Ended | 12 Months Ended
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May 31, 2016 | Aug. 31, 2015 | May 31, 2015 | Apr. 30, 2015 | May 31, 2014 | Mar. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Commercial paper |  |  |  |  |  |  | $ 0 |  |
Long-term debt, gross |  |  |  |  |  |  | 3,625,000,000 | $ 4,125,000,000 |
Proceeds from issuance of long-term debt |  |  |  |  |  |  | 499,000,000 | 498,000,000 | $ 498,000,000
Interest and debt expense |  |  |  |  |  |  | 80,000,000 | 90,000,000 | 94,000,000
Interest paid |  |  |  |  |  |  | 88,000,000 | 99,000,000 | $ 102,000,000
Notes payable |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  |  | $ 500,000,000 |  |  |
Payments of debt issuance costs |  |  |  |  |  | 3,000,000 |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  | 498,000,000 |  |  |
Retirement of long-term debt | $ 1,000,000,000 | $ 750,000,000 |  | $ 250,000,000 | $ 1,000,000,000 |  |  |  |
Consortium of investment-grade banks | Revolving credit facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity until March 2021 |  |  |  |  |  |  | 2,000,000,000 |  |
Notes due 2022 at 1.85% |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, gross | 500,000,000 |  |  |  |  |  | 500,000,000 | 0 |
Payments of debt issuance costs | 3,000,000 |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt | $ 499,000,000 |  |  |  |  |  |  |  |
Notes due 2020 at 1.75% |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 500,000,000 |  |  |  | 500,000,000 | 500,000,000 |
Payments of debt issuance costs |  |  | 3,000,000 |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  | $ 498,000,000 |  |  |  |  |  |
Notes due 2017 at 0.875% |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  |  | 250,000,000 | 250,000,000 | 250,000,000 |
Notes due 2021 at 2.75% |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  |  | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 |

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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + 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)(a)(3)) -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 -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 3: 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(13)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition 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. + 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)) -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 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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 + Details
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