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Debt (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Jul. 21, 2015
Debt Instrument [Line Items]        
Senior Notes, Noncurrent   $ 7,500,000,000    
Foreign Currency Transaction Gain (Loss), Realized $ 199,000,000      
Long-term Debt, Percentage Bearing Fixed Interest, Amount   15,346,000,000 $ 7,779,000,000  
Long-term debt   14,687,000,000 7,765,000,000  
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Maximum Amount   $ 2,500,000,000    
Debt Instrument, Redemption Price, Percentage   101.00%    
Long-term Debt and Capital Lease Obligations, Including Current Maturities     7,779,000,000  
Debt instrument call feature description   We may redeem all of our senior notes from time to time or all of the notes of each series at any time at the applicable redemption prices, plus accrued and unpaid interest.    
Line of credit facility, maximum borrowing capacity       $ 3,000,000,000
New credit facility value after BHI acquisition       $ 4,500,000,000
Long-term Debt, Current Maturities   $ (659,000,000) (14,000,000)  
Long-term Debt, Maturities, Repayments of Principal in Year Two   79,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Three   823,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Four   1,013,000,000    
Long-term Debt, Maturities Repayments of Principal in Year Five   1,300,000,000    
Line of Credit Facility, Remaining Borrowing Capacity   4,500,000,000 3,000,000,000  
Debt Instrument, Unamortized Discount   (132,000,000) (92,000,000)  
Long-term Debt   15,346,000,000 7,779,000,000  
Senior unsecured bridge facility   1,100,000,000 8,600,000,000  
Senior notes due November 2045 [Member]        
Debt Instrument [Line Items]        
Long-term debt   $ 2,000,000,000 0  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   5.00%    
Maturity date   November 2045    
Interest rate (in hundredths)   5.00%    
Senior Notes due November 2025 [Member]        
Debt Instrument [Line Items]        
Long-term debt   $ 2,000,000,000 0  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   3.80%    
Maturity date   November 2025    
Interest rate (in hundredths)   3.80%    
Senior Notes due November 2022 [Member]        
Debt Instrument [Line Items]        
Long-term debt   $ 1,250,000,000 0  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   3.375%    
Maturity date   November 2022    
Interest rate (in hundredths)   3.375%    
Senior Notes due November 2020 [Member]        
Debt Instrument [Line Items]        
Long-term debt   $ 1,250,000,000 0  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   2.70%    
Maturity date   November 2020    
Interest rate (in hundredths)   2.70%    
Senior notes due August 2023        
Debt Instrument [Line Items]        
Long-term debt   $ 1,100,000,000 $ 1,100,000,000  
Maturity date   August 2023 August 2023  
Interest rate (in hundredths)   3.50% 3.50%  
Senior Notes due November 2035 [Member]        
Debt Instrument [Line Items]        
Long-term debt   $ 1,000,000,000 $ 0  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   4.85%    
Maturity date   November 2035    
Interest rate (in hundredths)   4.85%    
Senior notes due September 2019        
Debt Instrument [Line Items]        
Long-term debt   $ 1,000,000,000 $ 1,000,000,000  
Maturity date   September 2019 September 2019  
Interest rate (in hundredths)   6.15% 6.15%  
Senior notes due September 2039        
Debt Instrument [Line Items]        
Long-term debt   $ 1,000,000,000 $ 1,000,000,000  
Maturity date   September 2039 September 2039  
Interest rate (in hundredths)   7.45% 7.45%  
Senior notes due August 2043        
Debt Instrument [Line Items]        
Long-term debt   $ 900,000,000 $ 900,000,000  
Maturity date   August 2043 August 2043  
Interest rate (in hundredths)   4.75% 4.75%  
Senior notes due September 2038        
Debt Instrument [Line Items]        
Long-term debt   $ 800,000,000 $ 800,000,000  
Maturity date   September 2038 September 2038  
Interest rate (in hundredths)   6.70% 6.70%  
Senior notes due August 2016        
Debt Instrument [Line Items]        
Long-term debt   $ 600,000,000 $ 600,000,000  
Maturity date   August 2016 August 2016  
Interest rate (in hundredths)   1.00% 1.00%  
Senior notes due November 2021        
Debt Instrument [Line Items]        
Long-term debt   $ 500,000,000 $ 500,000,000  
Maturity date   November 2021 November 2021  
Interest rate (in hundredths)   3.25% 3.25%  
Senior notes due November 2041        
Debt Instrument [Line Items]        
Long-term debt   $ 500,000,000 $ 500,000,000  
Maturity date   November 2041 November 2041  
Interest rate (in hundredths)   4.50% 4.50%  
Senior notes due August 2018        
Debt Instrument [Line Items]        
Long-term debt   $ 400,000,000 $ 400,000,000  
Maturity date   August 2018 August 2018  
Interest rate (in hundredths)   2.00% 2.00%  
Senior notes due September 2018        
Debt Instrument [Line Items]        
Long-term debt   $ 400,000,000 $ 400,000,000  
Maturity date   September 2018 September 2018  
Interest rate (in hundredths)   5.90% 5.90%  
Senior debentures due August 2096        
Debt Instrument [Line Items]        
Long-term debt   $ 300,000,000 $ 300,000,000  
Maturity date   August 2096 August 2096  
Interest rate (in hundredths)   7.60% 7.60%  
Debt instruments non-call feature description   may not be redeemed prior to maturity    
Senior debentures due February 2021        
Debt Instrument [Line Items]        
Long-term debt   $ 185,000,000 $ 185,000,000  
Maturity date   February 2021 February 2021  
Interest rate (in hundredths)   8.75% 8.75%  
Senior notes due February 2027 [Member] [Domain]        
Debt Instrument [Line Items]        
Long-term debt   $ 104,000,000 $ 104,000,000  
Maturity date   February 2027 February 2027  
Interest rate (in hundredths)   6.75% 6.75%  
Senior notes due May 2017 [Member] [Domain] [Member]        
Debt Instrument [Line Items]        
Long-term debt   $ 45,000,000 $ 45,000,000  
Maturity date   May 2017 May 2017  
Interest rate (in hundredths)   7.53% 7.53%  
Other Debt Obligations [Member]        
Debt Instrument [Line Items]        
Long-term debt   $ 144,000,000 $ 37,000,000