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Debt (Parenthetical) (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Apr. 30, 2017 | Aug. 31, 2016
Debt Instrument [Line Items] |  |  |  |
Debt instrument, outstanding | $ 3,337,100,000 |  |  |
3.75% Senior Notes due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, issuance amount | $ 500,000,000 | $ 500,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.75% |  |  |
6 5/8% Senior Notes due 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, issuance amount | $ 300,000,000 | 300,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.625% |  |  |
6.25% Senior Notes due 2032 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, issuance amount | $ 400,000,000 | 400,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.25% |  |  |
4.35% Senior Notes due 2044 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, issuance amount | $ 350,000,000 | 350,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.35% |  |  |
3.70% Senior Notes due 2045 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, issuance amount | $ 400,000,000 | 400,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.70% |  |  |
6.70% Fixed-to-Floating Rate Junior Subordinated Debentures due 2067 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, issuance amount | $ 0 | 1,000,000,000 |  |
Debt instrument, outstanding | $ 0 | 594,600,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.70% |  |  |
2.45% Senior Notes Due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, issuance amount | $ 500,000,000 | 500,000,000 |  | $ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage | 2.45% |  |  | 2.45%
4.125% Senior Notes due 2047 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, issuance amount | $ 850,000,000 | 0 | $ 850,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | 4.125% |  | 4.125% |
Discretionary Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from Lines of Credit | $ 0 | $ 0 |  |

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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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- 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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