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Derivative Instruments and Hedging Activities Derivatives, Additional Information (Details) € in Millions, shares in Millions, ¥ in Billions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2018 USD ($) Swap shares | Sep. 30, 2017 USD ($) shares | Sep. 30, 2016 USD ($) Swap | Sep. 30, 2018 EUR (€) Swap | Sep. 30, 2018 JPY (¥) Swap | Sep. 30, 2017 EUR (€) | Sep. 30, 2017 JPY (¥)
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | $ 3,175,000,000 | $ 2,105,000,000 |  |  |  |  |
Increase (Decrease) in Cash Collateral for Loaned Securities |  | $ 0 | $ 0 |  |  |  |  |
Hedge percentage for foreign exchange transactional exposures, Minimum |  | 70.00% |  |  |  |  |  |
Hedge percentage for foreign exchange transactional exposures, Maximum |  | 90.00% |  |  |  |  |  |
Derivative, amount of hedged ordinary shares | shares |  | 1.8 | 1.4 |  |  |  |  |
Number of fixed to floating interest rate swaps outstanding | Swap |  | 0 |  |  | 0 | 0 |  |
Number of interest rate derivatives terminated | 4 |  |  |  |  |  |  |
Gains (Losses) recognized in income for the ineffective portion of cash flow hedges |  |  | $ 0 | $ 0 |  |  |  |
Gains (Losses) Reclassifed from CTA to Income for Outstanding Net Investment Hedges |  | $ 0 | 0 | 0 |  |  |  |
1.4% Due in 2018 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Interest rate on notes |  | 1.40% |  |  | 1.40% | 1.40% |  |
Designated as Hedging Instrument |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | $ 3,173,000,000 | 2,080,000,000 |  |  |  |  |
Not Designated as Hedging Instrument |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 2,000,000 | 25,000,000 |  |  |  |  |
Interest rate swaps | Two Point Six Percent Due Two Thousand Seventeen |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, Amount of Hedged Item |  |  |  | $ 400,000,000 |  |  |  |
Number of fixed to floating interest rate swaps outstanding | Swap |  |  |  | 4 |  |  |  |
Interest rate on notes |  |  |  | 2.60% |  |  |  |
Interest rate swaps | 1.4% Due in 2018 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, Amount of Hedged Item |  |  |  | $ 300,000,000 |  |  |  |
Number of fixed to floating interest rate swaps outstanding | Swap |  |  |  | 3 |  |  |  |
Interest rate on notes |  |  |  | 1.40% |  |  |  |
Interest rate swaps | 7.125 % Due in 2017 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, Amount of Hedged Item |  |  |  | $ 150,000,000 |  |  |  |
Number of fixed to floating interest rate swaps outstanding | Swap |  |  |  | 1 |  |  |  |
Interest rate on notes |  |  |  | 7.125% |  |  |  |
Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, Notional Amount | ¥ |  |  |  |  |  | ¥ 35 |  | ¥ 35
Equity swap |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, Amount of Hedged Item |  | 73,000,000 | 58,000,000 |  |  |  |  |
One billion euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, Notional Amount | € |  |  |  |  | € 1,000 |  | € 1,000 |
750 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, Notional Amount | € |  |  |  |  | 750 |  |  |
423 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, Notional Amount | € |  |  |  |  | 423 |  |  |
58 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, Notional Amount | € |  |  |  |  | 58 |  | 58 |
215 million EUR maturing in March 2020 [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, Notional Amount | € |  |  |  |  | € 215 |  |  |
500 million euro net investment hedge [Member] [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, Notional Amount | € |  |  |  |  |  |  | € 423 |
Net Investment Hedging [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net |  | $ 45,000,000 | $ (138,000,000) | $ (82,000,000) |  |  |  |

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