Debt Debt	9 Months Ended
Sep. 30, 2013
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Senior debt In August 2013, we issued $3.0 billion aggregate principal amount of senior notes in four tranches: $600 million of 1.0% senior notes due August 2016, $400 million of 2.0% senior notes due August 2018, $1.1 billion of 3.5% senior notes due August 2023, and $900 million of 4.75% senior notes due August 2043. These senior notes rank equally with our existing and future senior unsecured indebtedness, have semiannual interest payments, and have no sinking fund requirements. We may redeem some or all of the notes of each series at any time at the applicable redemption prices, plus accrued and unpaid interest. Revolving credit facilities In April 2013, we amended our $2.0 billion five-year revolving credit facility expiring in 2016. The amendment increased the facility from $2.0 billion to $3.0 billion and extended the expiration to 2018. The purpose of the facility is to provide general working capital and credit for other corporate purposes. The full amount of the facility was available as of September 30, 2013.

Debt Debt

9 Months Ended

Sep. 30, 2013

Senior debt

In August 2013, we issued $3.0 billion aggregate principal amount of senior notes in four tranches: $600 million of 1.0% senior notes due August 2016, $400 million of 2.0% senior notes due August 2018, $1.1 billion of 3.5% senior notes due August 2023, and $900 million of 4.75% senior notes due August 2043. These senior notes rank equally with our existing and future senior unsecured indebtedness, have semiannual interest payments, and have no sinking fund requirements. We may redeem some or all of the notes of each series at any time at the applicable redemption prices, plus accrued and unpaid interest.

Revolving credit facilities

In April 2013, we amended our $2.0 billion five-year revolving credit facility expiring in 2016. The amendment increased the facility from $2.0 billion to $3.0 billion and extended the expiration to 2018. The purpose of the facility is to provide general working capital and credit for other corporate purposes. The full amount of the facility was available as of September 30, 2013.