Derivative Assets And Liabilities Table - Interest Rate Swaps Outstanding (Details) - USD ($) $ in Millions |
6 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
Jun. 30, 2017 |
Dec. 31, 2016 |
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| July 2017 [Member] | |||||||
| Notional Amount | [1] | $ 0 | $ 500 | ||||
| Type | [1],[2] | Forward-starting to pay a fixed rate of 3.90% and receive a floating rate | |||||
| July 2018 [Member] | |||||||
| Notional Amount | [1] | $ 300 | 200 | ||||
| Type | [1],[2] | Forward-starting to pay a fixed rate of 3.76% and receive a floating rate | |||||
| July 2019 [Member] | |||||||
| Notional Amount | [1] | $ 300 | 200 | ||||
| Type | [1],[2] | Forward-starting to pay a fixed rate of 3.64% and receive a floating rate | |||||
| July 2020 [Member] | |||||||
| Notional Amount | [1] | $ 400 | 0 | ||||
| Type | [1],[2] | Forward-starting to pay a fixed rate of 3.52% and receive a floating rate | |||||
| December 2018 [Member] | |||||||
| Notional Amount | $ 1,200 | 1,200 | |||||
| Type | [2] | Pay a floating rate based on a 3-month LIBOR and receive a fixed rate of 1.53% | |||||
| March 2019 [Member] | |||||||
| Notional Amount | $ 300 | $ 300 | |||||
| Type | [2] | Pay a floating rate based on a 3-month LIBOR and receive a fixed rate of 1.42% | |||||
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