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Debt (Narrative) (Details) - USD ($) | 2 Months Ended | 3 Months Ended | 9 Months Ended | 10 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 08, 2015 | Sep. 30, 2014 | Dec. 31, 2011 | Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Jul. 31, 2015 | Apr. 30, 2015 | Mar. 31, 2015 | Mar. 17, 2011
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  |  |  | $ 0 | $ 0 | $ 0 |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  |  |  |  |  | (33,500,000) | 0 | $ 0 |  |  |  |
Net unamortized premiums |  |  |  |  | 195,100,000 | 195,100,000 |  |  |  |  |  |
Interest Expense |  |  |  |  |  | 216,300,000 | 161,400,000 | 158,800,000 |  |  |  |
Capitalized interest |  |  |  |  |  | $ 87,400,000 | $ 78,200,000 | $ 67,700,000 |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  |  | 0.00% |  |  |  |  |  |
Commercial Paper Program [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper, capacity |  |  |  |  | $ 2,250,000,000 | $ 2,250,000,000 |  |  |  |  |  |
Maximum days of maturity of notes |  |  |  |  |  | 364 |  |  |  |  |  |
Weighted-average interest rate |  |  |  |  | 0.41% | 0.41% | 0.26% |  |  |  |  |
Debentures Due 2027 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  |  | 0.00% |  |  |  |  |  |
Five Point Two Percent Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 5.20% | 5.20% |  |  |  |  |  |
Debt instrument maturity period |  |  |  |  |  | 2025 |  |  |  |  |  |
Four Point Five Percent Senior Notes Member [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 4.50% | 4.50% |  |  |  |  |  |
Debt instrument maturity period |  |  |  |  |  | 2024 |  |  |  |  |  |
Five Point Seven Five Percent Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 5.75% | 5.75% |  |  |  |  |  |
Debt instrument maturity period |  |  |  |  |  | 2044 |  |  |  |  |  |
6.875% Senior notes due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  | 2020 |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 6.875% | 6.875% |  |  |  |  |  |
Debt instrument maturity period |  |  |  |  |  | 2020 |  |  |  |  |  |
8.50% Senior notes due 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 8.50% | 8.50% |  |  |  |  |  |
Debt instrument maturity period |  |  |  |  |  | 2019 |  |  |  |  |  |
7.875% Senior notes due 2040 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 7.875% | 7.875% |  |  |  |  |  |
Debt instrument maturity period |  |  |  |  |  | 2040 |  |  |  |  |  |
7.20% Debentures due 2027 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  | 2027 |  |  |  |  |  |
Unsecured debt instruments issued |  |  |  |  |  | $ 150,000,000.0 |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 7.20% | 7.20% |  |  |  |  |  |
Debt instrument maturity period |  |  |  |  |  | 2027 |  |  |  |  |  |
4.33% MARAD bonds due 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 4.33% | 4.33% |  |  |  |  |  |
Debt instrument maturity period |  |  |  |  |  | 2016 |  |  |  |  |  |
3.25% Senior notes due 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 3.25% | 3.25% |  |  |  |  |  |
Debt instrument maturity period |  |  |  |  |  | 2016 |  |  |  |  |  |
4.70% Senior notes due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 4.70% | 4.70% |  |  |  |  |  |
Debt instrument maturity period |  |  |  |  |  | 2021 |  |  |  |  |  |
Five Year Credit Facility Member |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total facility fee commitment |  |  |  |  | $ 0 | $ 0 | $ 0 |  |  |  |  |
Amounts outstanding |  |  |  |  | 0 | 0 | 0 |  |  |  |  |
Bonds [Member] | Four Point Three Three Percent and Four Point Six Five Percent Maritime Administration Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  |  |  |  |  | $ 3,100,000 |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  |  |  | $ 51,000,000 |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  | $ 14,300,000 |  |  |
Bonds [Member] | Four Point Six Five Percent Marine Administration Bonds Including Current Maturities Member |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  | 2020 |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  | 4.65% |  |
Acquired Debt [Member] | Four Point Three Three Percent Marine Administration Bonds Including Current Maturities Member |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  | 2016 |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  | 4.33% |  |
Senior Notes [Member] | Five Point Two Percent Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 700,000,000 |
Senior Note Maturity Year |  |  |  | 2025 |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  | 5.20% |
Discount to senior notes |  |  |  |  |  |  |  |  |  |  | $ 2,600,000 |
Senior Notes [Member] | Four Point Five Percent Senior Notes Member [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 625,000,000 |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  |  | 2024 |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  | 4.50% |  |  |  |  |
Discount to senior notes |  |  |  |  |  |  | $ 900,000 |  |  |  |  |
Senior Notes [Member] | 6.875% Senior notes due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 900,000,000 | $ 900,000,000 |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  | 2020 |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 6.875% | 6.875% |  |  |  |  |  |
Senior Notes [Member] | 8.50% Senior notes due 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 500,000,000 | $ 500,000,000 |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  | 2019 |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 8.50% | 8.50% |  |  |  |  |  |
Senior Notes [Member] | 7.875% Senior notes due 2040 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 300,000,000 | $ 300,000,000 |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  | 2040 |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 7.88% | 7.88% |  |  |  |  |  |
Senior Notes [Member] | 7.20% Debentures due 2027 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 150,000,000 | $ 150,000,000 |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 7.20% | 7.20% |  |  |  |  |  |
Senior Notes [Member] | 4.70% Senior notes due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  | 2021 |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 4.70% |  |  |  |  |  |  |  |  |
Discount to senior notes |  |  | $ 29,600,000 |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Five Point Seven Five Percent Senior Notes Member [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 625,000,000 |  |  |  |  |  |  |  |  | $ 400,000,000 |
Senior Note Maturity Year |  | 2044 |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 5.75% |  |  |  |  |  |  |  |  | 5.75% |
Discount to senior notes |  |  |  |  |  |  | $ 2,800,000 |  |  |  | $ 18,700,000 |
Senior Notes [Member] | Three Point Two Five Percent Senior Notes Member |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000
Senior Note Maturity Year |  |  |  | 2016 |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  | 3.25%
Gains (Losses) on Extinguishment of Debt |  |  |  |  |  | $ 3,800,000 |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  |  |  | $ 145,400,000 | 854,600,000 |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  |  |  | $ 878,000,000 |
Gains (Losses) on Extinguishment of Debt, before Write off of Deferred Debt Issuance Cost |  |  |  |  |  | 23,400,000 |  |  |  |  |  |
Amortization of Debt Discount (Premium) |  |  |  |  |  | 1,700,000 |  |  |  |  |  |
Write off of Deferred Debt Issuance Cost |  |  |  |  |  | 1,500,000 |  |  |  |  |  |
Senior Notes [Member] | TenderOffer [Member] | Three Point Two Five Percent Senior Notes Member |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  |  |  |  |  | (26,600,000) |  |  |  |  |  |
Revolving Credit Facility [Member] | Five Year Credit Facility Member |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Current borrowing capacity |  |  |  |  | $ 2,250,000,000 | $ 2,250,000,000 |  |  |  |  |  |
Line of Credit Facility, Commitment fee Percentage, Effect of One Notch Change in Rating |  |  |  |  |  | 0.025% |  |  |  |  |  |
Maximum amount of right to increase the commitment |  |  |  |  | 2,750,000,000 | $ 2,750,000,000 |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  |  |  |  | 0.15% |  |  |  |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  |  |  |  | $ 0 | $ 0 |  |  |  |  |  |
Revolving Credit Facility [Member] | Base Rate [Member] | Five Year Credit Facility Member |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 0.25% |  |  |  |  |  |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Five Year Credit Facility Member |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate, Effect of One Notch Change in Rating |  |  |  |  |  | 0.125% |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.25% |  |  |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] | Five Year Credit Facility Member |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum Percent of Debt to Total Capitalization Ratio | 50.00% |  |  |  | 60.00% |  |  |  |  |  |  |

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- Definition The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: 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=34725769&loc=d3e28878-108400 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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- Definition Reflects the difference between the fair value of payments made to legally extinguish a debt and its carrying value at that time. This item excludes the write-off of amounts previously capitalized as debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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