Earnings (Loss) Per Share Earnings (Loss) Per Share (Computation Of Basic Earnings And Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions |
3 Months Ended |
6 Months Ended |
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
| Antidilutive Securities Excluded from Computation of Earnings (Loss) Per Share |
|
|
|
|
| Net income (loss) |
$ (38)
|
$ (140)
|
$ 402
|
$ 302
|
| Weighted Average Number of Shares Outstanding, Basic |
301
|
312
|
301
|
311
|
| Dilutive potential common shares related to stock award plans and from assumed exercise of stock options |
0
|
0
|
3
|
7
|
| Weighted Average Number of Shares Outstanding, Diluted |
301
|
312
|
315
|
334
|
| Basic |
$ (0.13)
|
$ (0.45)
|
$ 1.34
|
$ 0.97
|
| Diluted |
$ (0.13)
|
$ (0.45)
|
$ 1.28
|
$ 0.90
|
| Convertible Debt |
|
|
|
|
| Antidilutive Securities Excluded from Computation of Earnings (Loss) Per Share |
|
|
|
|
| Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants |
0
|
0
|
2
|
9
|
| Warrants |
|
|
|
|
| Antidilutive Securities Excluded from Computation of Earnings (Loss) Per Share |
|
|
|
|
| Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants |
0
|
0
|
9
|
7
|