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Derivative and Other Financial Instruments (Net Investment Hedge Narrative) (Details) € in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 EUR (€) | Nov. 30, 2018 EUR (€) | Jan. 31, 2018 USD ($) | Jan. 31, 2018 EUR (€)
Derivative [Line Items] |  |  |  |  |  |  |
Gain (loss), recognized in OCI |  | $ 47 | $ (153) |  |  |  |
Gain (loss) on net investment hedge, net of tax |  | 43 | (134) |  |  |  |
Carrying amount of hedged net investment |  | 1,296 |  | € 1,131 |  |  |
Gain (loss) on net investment hedge | $ 19 |  |  |  |  |  |
Proceeds from settlement of derivative reflected in cash provided by investing activities |  | 15 |  |  |  |  |
Foreign exchange |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Gain (loss), recognized in OCI |  | $ 11 | 0 |  |  |  |
Derivative fixed rate | 4.75% |  |  |  | 4.75% |  |
Derivative,notional amount | $ 875 |  |  |  | € 768 |  |
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Gain (loss), recognized in OCI |  |  | (59) |  |  |  |
Gain (loss) on net investment hedge, net of tax |  |  | $ (36) |  |  |  |
Net Investment Hedging | Cross Currency Interest Rate Contract |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative,notional amount |  |  |  |  |  | $ 875 | € 718
Net Investment Hedging | Cross Currency Interest Rate Contract On U.S. Notional Amount |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative fixed rate |  |  |  |  |  | 4.75% | 4.75%
Net Investment Hedging | Cross Currency Interest Rate Contract On Euro Notional Amount |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative fixed rate | 1.84% |  |  |  | 1.84% | 2.50% | 2.50%

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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