| **Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions**   | 3 Months Ended | 9 Months Ended |
|------------------------------------------------------------------------------------------------|----------------|----------------|
||
| Net income (loss)                                                                              | $ (1)          | $ (45)         | $ 401 | $ 257 |
| **Other comprehensive income (loss), net of tax:**                                             |           |           |   |   |
| Change in unrealized net gains and losses on available-for-sale securities                     | (5)            | (4)            | (4) | (3) |
| Reclassification adjustment for realized net gains and losses on available-for-sale securities | 0              | 1              | (1) | 0 |
| Change in unrealized net gains and losses on derivative instruments                            | 39             | 10             | 66 | 2 |
| Reclassification adjustment for realized net gains and losses on derivative instruments        | (8)            | (4)            | (18) | (11) |
| Foreign currency translation adjustments                                                       | (17)           | (16)           | (28) | (47) |
| Total other comprehensive income (loss), net of tax                                            | 9              | (13)           | 15 | (59) |
| Total comprehensive income (loss)                                                              | $ 8            | $ (58)         | $ 416 | $ 198 |

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| - Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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| - Definition
Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.
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Amount after tax and reclassification adjustments of other comprehensive income (loss).
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Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.
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| - Definition
Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).
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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).
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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.
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