Debt and Equity Transactions (Unaudited) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Feb. 27, 2015	Dec. 31, 2014	Apr. 30, 2014
Extinguishment of Debt [Line Items]
Long-term Debt, Gross	$ 20,900,000,000		$ 20,900,000,000
Liabilities, Fair Value Adjustment			225,000,000
Debt Instrument, Unamortized Discount (Premium), Net	21,000,000		21,000,000
Unamortized Debt Issuance Expense	116,000,000		116,000,000			$ 121,000,000
Net gain on early extinguishment of debt	0	$ 5,000,000	0	$ 5,000,000
Bank Term Loan [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Face Amount	4,000,000,000		4,000,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Two					$ 205,000,000	650,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Three					272,000,000	200,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Four					1,000,000,000	$ 2,200,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Five					313,000,000
Long-term Debt, Maturities, Repayments of Principal after Year Five					$ 1,300,000,000
Credit Facility [Domain] | Revolving Credit Facility [Member]
Extinguishment of Debt [Line Items]
Long-term Debt, Gross	985,000,000		985,000,000
Letters of Credit Outstanding, Amount	42,000,000		42,000,000
Line of Credit Facility, Remaining Borrowing Capacity	3,000,000,000		3,000,000,000
Line Of Credit Facility Remaining Borrowing Capacity Available For Letters Of Credit	1,500,000,000		1,500,000,000
Senior Notes [Member] | 6.625% Senior Notes due 2021 [Member]
Extinguishment of Debt [Line Items]
Extinguishment of Debt, Amount		210,000,000
Debt Instrument, Interest Rate, Stated Percentage							6.625%
Net gain on early extinguishment of debt		$ 6,000,000
Cerro Verde [Member] | Credit Facility [Domain]
Extinguishment of Debt [Line Items]
Long-term Debt, Gross	1,300,000,000		1,300,000,000
Line of Credit Facility, Maximum Borrowing Capacity	1,800,000,000		1,800,000,000
Letters of Credit Outstanding, Amount	0		0
Line of Credit Facility, Remaining Borrowing Capacity	$ 531,000,000		$ 531,000,000
Term of Debt Agreement			5 years