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Fair Value Measurements (Schedule Of Assets Measured At Fair Value On A Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
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Mar. 31, 2012
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of investments measured on a recurring basis |
$ 2,327 |
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Level 1 [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of investments measured on a recurring basis |
520 |
[1] |
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Level 2 [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of investments measured on a recurring basis |
1,807 |
[2] |
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Level 3 [Member]
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of investments measured on a recurring basis |
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[3] |
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Equity Securities [Member] | Short-Term Investments [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of investments measured on a recurring basis |
294 |
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Equity Securities [Member] | Level 1 [Member] | Short-Term Investments [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Fair value of investments measured on a recurring basis |
294 |
[1] |
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Equity Securities [Member] | Level 3 [Member] | Short-Term Investments [Member]
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of investments measured on a recurring basis |
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[3] |
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Fixed Income Securities [Member] | Short-Term Investments [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of investments measured on a recurring basis |
329 |
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Fixed Income Securities [Member] | Other Assets [Member]
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Fair value of investments measured on a recurring basis |
974 |
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Fixed Income Securities [Member] | Level 1 [Member] | Short-Term Investments [Member]
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of investments measured on a recurring basis |
1 |
[1] |
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Fixed Income Securities [Member] | Level 1 [Member] | Other Assets [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of investments measured on a recurring basis |
225 |
[1] |
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Fixed Income Securities [Member] | Level 2 [Member] | Short-Term Investments [Member]
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Fair value of investments measured on a recurring basis |
328 |
[2] |
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Fixed Income Securities [Member] | Level 2 [Member] | Other Assets [Member]
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Fair value of investments measured on a recurring basis |
749 |
[2] |
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Fixed Income Securities [Member] | Level 3 [Member] | Short-Term Investments [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of investments measured on a recurring basis |
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[3] |
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Fixed Income Securities [Member] | Level 3 [Member] | Other Assets [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of investments measured on a recurring basis |
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[3] |
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Forward Contracts [Member] | Other Current Assets [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of investments measured on a recurring basis |
9 |
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Forward Contracts [Member] | Level 2 [Member] | Other Current Assets [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of investments measured on a recurring basis |
9 |
[2] |
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Forward Contracts [Member] | Level 3 [Member] | Other Current Assets [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Fair value of investments measured on a recurring basis |
|
[3] |
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Interest Rate Swaps [Member] | Other Current Assets [Member]
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Fair value of investments measured on a recurring basis |
10 |
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Interest Rate Swaps [Member] | Other Assets [Member]
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of investments measured on a recurring basis |
580 |
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Interest Rate Swaps [Member] | Level 2 [Member] | Other Current Assets [Member]
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Fair value of investments measured on a recurring basis |
10 |
[2] |
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Interest Rate Swaps [Member] | Level 2 [Member] | Other Assets [Member]
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of investments measured on a recurring basis |
580 |
[2] |
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Interest Rate Swaps [Member] | Level 3 [Member] | Other Current Assets [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of investments measured on a recurring basis |
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[3] |
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Interest Rate Swaps [Member] | Level 3 [Member] | Other Assets [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of investments measured on a recurring basis |
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[3] |
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Cross Currency Swaps [Member] | Other Assets [Member]
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Fair value of investments measured on a recurring basis |
131 |
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|
Cross Currency Swaps [Member] | Level 2 [Member] | Other Assets [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Fair value of investments measured on a recurring basis |
131 |
[2] |
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Cross Currency Swaps [Member] | Level 3 [Member] | Other Assets [Member]
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of investments measured on a recurring basis |
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[3] |
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