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Derivatives And Hedging Activities Net Investment Hedges (Details) € in Millions, ¥ in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Jun. 30, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Sep. 15, 2016 EUR (€) | Mar. 10, 2015 EUR (€)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of derivatives |  |  |  |  |  |  |  |  |  | $ 6 | $ 12 |  |  |  |  |  |
Net Investment Hedging | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on net investment hedge, net of tax |  |  |  | $ (22) |  |  | $ (44) |  |  | 31 | (147) |  |  |  |  |  |
Net Investment Hedging | Designated as Hedging Instrument | Euro-Denominated Senior Notes, 1.500% Due 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument designated as net investment hedge | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 700
Net Investment Hedging | Designated as Hedging Instrument | Euro-denominated Senior Notes, 1.600% Due 2028 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument designated as net investment hedge | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 500 |
Net Investment Hedging | Designated as Hedging Instrument | Euro-Denominated Senior Notes, 1.500% Due 2025 and Euro-Denominated Senior Notes, 1.600% Due 2028 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on net investment hedge, net of tax |  |  |  | (22) |  |  | $ (44) |  |  | 31 | $ (147) |  |  |  |  |  |
Net investment hedge gains (losses) included in accumulated other comprehensive income |  | $ (117) |  | $ (86) |  | $ (117) |  |  |  | (86) |  |  |  |  |  |  |
Amount of ineffectiveness on net investment hedges |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |
Foreign exchange forward | China, Yuan Renminbi | Net Investment Hedging | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of derivative | $ 75 | 290 | $ 345 |  | $ 75 | $ 290 |  | $ 345 | $ 265 |  |  | ¥ 486 | ¥ 1,900 | ¥ 2,400 | ¥ 1,800 |  |
Derivative, Maturity Date |  |  |  |  | Dec. 20, 2018 | Jun. 20, 2018 |  | Dec. 21, 2017 | Jun. 21, 2017 |  |  |  |  |  |  |  |
Settlement of derivatives | $ 10 | $ 16 | $ 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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