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Hedging Activities - Narrative (Details) £ in Millions, $ in Millions, $ in Billions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2019 GBP (£) | Sep. 30, 2019 GBP (£) | Mar. 31, 2019 USD ($) | Mar. 31, 2019 CAD ($) | Mar. 31, 2019 EUR (€) | Mar. 31, 2019 GBP (£) | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 GBP (£)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt outstanding | $ 7,700 |  | $ 7,700 |  |  |  |  |  | $ 7,600 |  |  |  |  |
Gains (losses) on non-derivative net investment hedge | (3) |  | 26 |  |  |  |  |  |  |  |  |  |  |
Gains from fair value hedges recorded in earnings | 44 |  | 44 |  |  |  |  |  |  |  |  |  |  |
Gains from cash flow hedges recorded within other comprehensive income | 8 | $ 35 | 33 | $ 37 |  |  |  |  |  |  |  |  |  |
Derivatives designated for hedge accounting |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) from net investment hedges recorded within other comprehensive income | (59) | 39 | (8) | 223 |  |  |  |  |  |  |  |  |  |
Forward contracts to hedge Euro against British Pound cash flows | Derivatives not Designated for Hedge Accounting |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional values of financial instruments | 23 |  | 23 |  |  |  |  |  | 28 |  |  |  |  |
Forward contracts to offset impact of ineffectiveness of net investment hedges | Derivatives not Designated for Hedge Accounting |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on net investment hedges | 3 |  | (36) |  |  |  |  |  |  |  |  |  |  |
Notional values of financial instruments | € |  |  |  |  |  | € 250,000,000 |  |  |  |  |  |  |  |
Net Investment Hedging | Derivatives designated for hedge accounting |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives used in net investment hedge, gains (loss) gross | (20) | 63 | (11) | 102 |  |  |  |  |  |  |  |  |  |
Net Investment Hedging | November 2018 cross currency swaps | Derivatives designated for hedge accounting |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on net investment hedges |  |  | 34 |  |  |  |  |  |  |  |  |  |  |
Notional values of financial instruments |  |  |  |  | $ 1.5 |  |  |  |  | $ 1.5 |  | £ 932 |  |
Proceeds from termination of derivative instruments |  |  | 84 |  |  |  |  |  |  |  |  |  |  |
Cash Flow Hedging | Derivatives designated for hedge accounting |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains from cash flow hedges recorded within other comprehensive income | 5 | $ 40 | 40 | $ 42 |  |  |  |  |  |  |  |  |  |
Cash Flow Hedging | Forward contracts | Derivatives designated for hedge accounting |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional values of financial instruments | 81 |  | 81 |  |  |  |  |  | 81 |  |  |  |  |
Cash Flow Hedging | Cross currency swap | Derivatives designated for hedge accounting |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional values of financial instruments | $ 2,900 |  | $ 2,900 |  |  |  |  |  | $ 2,900 |  |  |  |  |
Euro Denominated Notes | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt outstanding | € |  |  |  |  |  | 250,000,000 |  |  |  |  |  |  | € 1,950,000,000 |
Euro Denominated Notes | Term Loan | Net Investment Hedging |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt outstanding | € |  |  |  |  |  | € 1,700,000,000 |  |  |  |  | € 1,950,000,000 |  |  |
British Pound Sterling Denominated Notes | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt outstanding | £ |  |  |  |  |  |  | £ 450 | £ 450 |  |  |  | £ 450 |  | £ 450

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