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Equity (Accumulated Other Comprehensive Loss) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013
Unrealized derivative losses, net |
Balance at January 1 | $ (481)
Other comprehensive income before reclassifications | 46
Amounts reclassified from accumulated other comprehensive loss | 128
Net current-period other comprehensive income | 174
Balance at December 31 | (307)
Unfunded pension obligations, net |
Balance at January 1 | (382)
Other comprehensive income before reclassifications | 78
Amounts reclassified from accumulated other comprehensive loss | 13
Net current-period other comprehensive income | 91
Balance at December 31 | (291)
Available for sale securities, net |
Balance at January 1 | 0
Other comprehensive income before reclassifications | (1)
Amounts reclassified from accumulated other comprehensive loss | 1
Net current-period other comprehensive income | 0
Balance at December 31 | 0
Foreign currency translation adjustment, net |
Balance at January 1 | (2,057)
Other comprehensive income before reclassifications | (263)
Amounts reclassified from accumulated other comprehensive loss | 36
Net current-period other comprehensive income | (227)
Balance at December 31 | (2,284)
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |
Balance at January 1 | (2,920)
Other comprehensive income before reclassifications | (140)
Amounts reclassified from accumulated other comprehensive loss | 178
Net current-period other comprehensive income | 38
Balance at December 31 | $ (2,882)

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