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Debt - Senior Notes (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 19, 2014 | Nov. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2014 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2017 | Nov. 30, 2014 | Oct. 31, 2014
Debt Instrument |  |  |  |  |  |  |  |  |  |
Cash dividends declared (in dollars per share) |  |  | $ 0.59 | $ 0.54 |  | $ 1.18 | $ 1.06 |  |  |
Unamortized discount |  |  | $ 2,704,000 |  |  | $ 2,704,000 |  | $ 2,901,000 |  |
Repayment of debt |  |  |  |  |  | $ 696,250,000 | $ 80,000,000 |  |  |
Portion of senior notes | Derivatives designated as hedging instruments | Treasury lock | Senior notes | Cash flow hedge contracts |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Notional amount of derivative |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.00
Special cash dividend |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Cash dividends declared (in dollars per share) | $ 16.50 |  |  |  |  |  |  |  |  |
Cash dividends |  |  |  |  | $ 2,760,000,000 |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  | $ 2,500,000,000.0 |
Unamortized discount |  |  |  |  |  |  |  |  | 4,000,000 |
Repayment of debt |  | $ 250,000,000 |  |  |  |  |  |  |  |
Redemption price |  |  |  |  |  | 101.00% |  |  |  |
Fair value disclosure |  |  | $ 2,410,000,000 |  |  | $ 2,410,000,000 |  | $ 2,670,000,000 |  |
Senior notes | Standard & Poor's, BB plus Rating |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Decrease in credit rating, interest rate adjustment (in bps) |  |  |  |  |  | 0.25% |  |  |  |
Senior notes | Standard & Poor's, BB Rating |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Decrease in credit rating, interest rate adjustment (in bps) |  |  |  |  |  | 0.50% |  |  |  |
Senior notes | Standard & Poor's, BB- Rating |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Decrease in credit rating, interest rate adjustment (in bps) |  |  |  |  |  | 0.75% |  |  |  |
Senior notes | Standard & Poor's, B Plus or Below |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Decrease in credit rating, interest rate adjustment (in bps) |  |  |  |  |  | 1.00% |  |  |  |
Senior notes | Moody's, Ba1 Rating |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Decrease in credit rating, interest rate adjustment (in bps) |  |  |  |  |  | 0.25% |  |  |  |
Senior notes | Moody's, Ba2 Rating |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Decrease in credit rating, interest rate adjustment (in bps) |  |  |  |  |  | 0.50% |  |  |  |
Senior notes | Moody's, Ba3 Rating |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Decrease in credit rating, interest rate adjustment (in bps) |  |  |  |  |  | 0.75% |  |  |  |
Senior notes | Moody's, B1 Rating |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Decrease in credit rating, interest rate adjustment (in bps) |  |  |  |  |  | 1.00% |  |  |  |
Senior notes | 2018 Senior Notes | Derivatives Not Designated as Hedging Instruments | Treasury lock |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  | $ 750,000,000 |

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