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Derivatives And Hedging Activities Net Investment Hedges (Details) € in Millions, $ in Millions, ¥ in Billions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | May 31, 2016 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 CNY (¥) | Jun. 30, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Jun. 30, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Sep. 15, 2016 EUR (€) | Mar. 31, 2016 CNY (¥) | Mar. 10, 2015 EUR (€)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of derivatives | $ 4 | $ 10 |  |  |  |  |  |  |  |  |  | $ 2 | $ 28 | $ 1 |  |  |  |  |  |  |  |
Amount of Ineffectiveness on Net Investment Hedge |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Net Investment Hedging | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on Net Investment Hedge, net of tax |  |  |  |  |  |  |  |  |  |  |  | 67 | (177) | 67 |  |  |  |  |  |  |  |
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
Gain (loss) on Net Investment Hedge, net of tax |  |  |  |  |  |  |  |  |  |  |  |  | (177) |  |  |  |  |  |  |  |  |
Net investment hedge gains (losses) included in accumulated other comprehensive income |  |  | $ (117) |  |  |  |  | $ (117) |  |  |  |  | (117) |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  | 67 |  |  |  |  |  |  |  |  |  |
Net investment hedge gains (losses) included in accumulated other comprehensive income | (50) |  |  |  |  | $ (50) |  |  |  |  |  | (50) |  |  |  |  |  |  |  |  |  |
Foreign Exchange Forward [Member] | China, Yuan Renminbi | Net Investment Hedging | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of derivative | $ 85 | $ 75 | 290 | $ 345 |  | $ 85 | $ 75 | $ 290 | $ 345 | $ 265 | $ 370 | $ 85 | $ 290 | $ 265 | ¥ 0.6 | ¥ 0.5 | ¥ 1.9 | ¥ 2.4 | ¥ 1.8 |  | ¥ 2.4 |
Derivative, Maturity Date |  |  |  |  |  | Mar. 29, 2019 | Dec. 20, 2018 | Jun. 20, 2018 | Dec. 21, 2017 | Jun. 21, 2017 | May 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Settlement of derivatives |  |  | $ 16 | $ 12 | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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