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Debt and Lines of Credit - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2017 | May 31, 2017 | Mar. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Commercial paper | $ 0 |  |  | $ 0 |  | $ 0 |  |
Retirement of long-term debt | 375,000,000 |  | $ 250,000,000 |  |  |  |  |
Long-term debt, gross | 3,600,000,000 |  |  | 3,600,000,000 |  | 3,600,000,000 |  | $ 3,625,000,000
Proceeds from issuance of long-term debt |  |  |  |  |  | 605,000,000 | $ 499,000,000 |
Interest and debt expense |  |  |  | 20,000,000 | $ 21,000,000 | 38,000,000 | $ 43,000,000 |
Notes payable |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross |  | $ 600,000,000 |  |  |  |  |  |
Payments of debt issuance costs |  | 3,000,000 |  |  |  |  |  |
Proceeds from issuance of long-term debt |  | 605,000,000 |  |  |  |  |  |
Notes due 2021 at 2.75% |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross | $ 550,000,000 | $ 300,000,000 |  | $ 550,000,000 |  | $ 550,000,000 |  | $ 250,000,000
Long-term debt stated interest rate (in percentage) | 2.75% | 2.75% |  | 2.75% |  | 2.75% |  | 2.75%
Notes due 2024 at 2.625% |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross | $ 300,000,000 | $ 300,000,000 |  | $ 300,000,000 |  | $ 300,000,000 |  | $ 0
Long-term debt stated interest rate (in percentage) | 2.625% | 2.625% |  | 2.625% |  | 2.625% |  | 2.625%
Revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity until March 2022 | $ 2,000,000,000 |  |  | $ 2,000,000,000 |  | $ 2,000,000,000 |  |

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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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