Net Income (Loss) Per Share (Computation Of Basic Earnings And Diluted Earnings Per Share) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||||||||||||||||||||||||||
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2014
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Mar. 31, 2013
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Mar. 31, 2012
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Earnings Per Share Reconciliation [Abstract] | |||||||||||||||||||||||||||||||||||
Net income (loss) | $ 367 | [1] | $ (308) | [2] | $ (273) | [3] | $ 222 | [4] | $ 323 | [5] | $ (45) | [6] | $ (381) | [7] | $ 201 | [8] | $ 8 | $ 98 | $ 76 | ||||||||||||||||
Weighted-average common stock outstanding - basic | 308 | 310 | 331 | ||||||||||||||||||||||||||||||||
Dilutive potential common shares | 8 | 3 | 5 | ||||||||||||||||||||||||||||||||
Weighted-average common stock outstanding - diluted | 316 | 313 | 336 | ||||||||||||||||||||||||||||||||
Basic | $ 1.18 | $ (1.00) | $ (0.89) | $ 0.73 | $ 1.07 | $ (0.15) | $ (1.21) | $ 0.63 | $ 0.03 | $ 0.32 | $ 0.23 | ||||||||||||||||||||||||
Diluted | $ 1.15 | $ (1.00) | $ (0.89) | $ 0.71 | $ 1.05 | $ (0.15) | $ (1.21) | $ 0.63 | $ 0.03 | $ 0.31 | $ 0.23 | ||||||||||||||||||||||||
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