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Long-Term Debt Long Term Debt (Senior Notes) (Details) - USD ($) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 07, 2016 | Jul. 20, 2015 | Apr. 01, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 23, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  | $ 0 | $ 2,835,000,000 | $ 1,400,000,000 |
Senior Notes [Member] | 6.250% Senior Notes Due 2021 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount | $ 800,000,000 |  |  |  |  |  |
Stated interest rate | 6.25% |  |  | 6.25% |  |  |
Proceeds from issuance of long-term debt | $ 789,000,000 |  |  |  |  |  |
Senior Notes [Member] | 5.500% Senior Notes Due 2020 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  | $ 600,000,000.0 |  |  |  |  |
Stated interest rate |  | 5.50% |  | 5.50% |  |  |
Proceeds from issuance of long-term debt |  | $ 593,000,000 |  |  |  |  |
Senior Notes [Member] | 6.375% Senior Notes Due 2023 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  | $ 800,000,000.0 |  |  |  |
Stated interest rate |  |  | 6.375% | 6.375% |  |  |
Proceeds from issuance of long-term debt |  |  | $ 787,000,000 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 5.875%
Subsequent Event [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  | $ 2,200,000,000.0
Subsequent Event [Member] | Senior Notes [Member] | 6.250% Senior Notes Due 2021 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior Notes Call Premium |  |  |  |  |  |  | 32,000,000
Subsequent Event [Member] | Senior Notes [Member] | 5.500% Senior Notes Due 2020 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior Notes Call Premium |  |  |  |  |  |  | 17,000,000
Subsequent Event [Member] | Senior Notes [Member] | 6.375% Senior Notes Due 2023 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior Notes Call Premium |  |  |  |  |  |  | 44,000,000
Subsequent Event [Member] | Senior Notes [Member] | Four Point Eight Seven Five Percentage Senior Notes Due Two Thousand Twenty Three [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  | $ 1,000,000,000.0
Stated interest rate |  |  |  |  |  |  | 4.875%
Subsequent Event [Member] | Senior Notes [Member] | Five Point Five Zero Zero Percentage Senior Notes Due Two Thousand Twenty Six [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  | $ 800,000,000
Stated interest rate |  |  |  |  |  |  | 5.50%
Subsequent Event [Member] | Senior Notes [Member] | Five Point Eight Seven Five Percentage Senior Notes Due Two Thousand Twenty Eight [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  | $ 400,000,000

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