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Debt - Senior Notes (Details) - USD ($) |  | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 19, 2014 | Dec. 31, 2014 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016 | Nov. 30, 2014 | Oct. 31, 2014
Debt Instrument |  |  |  |  |  |  |
Cash dividends declared (in dollars per share) |  |  | $ 2.52 | $ 2.14 | $ 2.08 |  |
Cash dividends |  |  | $ 397,863,000 | $ 338,208,000 | $ 323,836,000 |  |
Unamortized discount |  |  | $ 2,523,000 | 2,901,000 |  |  |
Derivatives designated as hedging instruments | Portion of Senior notes | Treasury lock | Senior notes | Cash flow hedge contracts- foreign currency |  |  |  |  |  |  |
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 |  |  |  |  |  | $ 2,500,000,000.00 |
Unamortized discount |  |  |  |  |  | 4,000,000 |
Redemption price |  |  | 101.00% |  |  |  |
Fair value disclosure |  |  | $ 2,330,000,000 | $ 2,670,000,000 |  |  |
Senior notes | Standard & Poor's, BB Plus Rating |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Decrease in credit rating, interest rate adjustment (in bps) |  |  | 25.00% |  |  |  |
Senior notes | Standard & Poor's, BB Rating |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Decrease in credit rating, interest rate adjustment (in bps) |  |  | 50.00% |  |  |  |
Senior notes | Standard & Poor's, BB- Rating |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Decrease in credit rating, interest rate adjustment (in bps) |  |  | 75.00% |  |  |  |
Senior notes | Standard & Poor's, B Plus or Below |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Decrease in credit rating, interest rate adjustment (in bps) |  |  | 100.00% |  |  |  |
Senior notes | Moody's, Ba1 Rating |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Decrease in credit rating, interest rate adjustment (in bps) |  |  | 25.00% |  |  |  |
Senior notes | Moody's, Ba2 Rating |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Decrease in credit rating, interest rate adjustment (in bps) |  |  | 50.00% |  |  |  |
Senior notes | Moody's, Ba3 Rating |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Decrease in credit rating, interest rate adjustment (in bps) |  |  | 75.00% |  |  |  |
Senior notes | Moody's, B1 Rating |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Decrease in credit rating, interest rate adjustment (in bps) |  |  | 100.00% |  |  |  |
Senior notes | Senior notes Due May 1, 2018 |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 750,000,000 |

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