($ in millions, except per share data)

Three months ended

Six months ended

June 30,

2012

2011

2012

2011

Numerator:

Net income (loss)

$

423

$

(624

)

$

1,189

$

(100

)

Denominator:

Weighted average common shares outstanding

490.6

523.1

494.9

528.2

Effect of dilutive potential common shares:

Stock options

2.3

--

2.2

--

Restricted stock units and performance share awards (non-participating)

0.9

--

0.8

--

Weighted average common and dilutive potential common shares outstanding

493.8

523.1

497.9

528.2

Earnings per share - Basic

$

0.86

$

(1.19

)

$

2.40

$

(0.19

)

Earnings per share - Diluted

$

0.86

$

(1.19

)

$

2.39

$

(0.19

)