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Investments (Cost Method Investments) (Details) (USD $)
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12 Months Ended | |
|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Air Touch [Member]
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| Fair value of AirTouch preferred stock related to redeemable preferred shares | $ 1,700,000,000 | $ 1,800,000,000 |
| Aggregate redemption value | 1,750,000,000 | |
| Carrying amount of redeemable preferred stock | 1,500,000,000 | 1,500,000,000 |
| Fair value amount of redeemable preferred stock | 1,700,000,000 | 1,800,000,000 |
| Nonredeemable preferred stock | 100,000,000 | 100,000,000 |
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Preferred Shares Redeemable in April 2020 [Member]
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| Aggregate redemption value | $ 1,650,000,000 |