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Debt - Short-term and Long-term Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Mar. 11, 2015
Debt Instrument [Line Items]      
Commercial paper $ 0 $ 100  
Current maturities of long-term debt 250 0  
Other, including capital leases 26 49  
Total short-term debt 276 149  
Long-term debt, carrying value 4,756 5,020  
$250 million, 5.375% Notes due 2017 [Member] | Uncollateralized Debt [Member]      
Debt Instrument [Line Items]      
Long-term debt, face value $ 250 $ 250  
Long-term debt, stated interest rate 5.375% 5.375%  
Long-term debt, carrying value $ 0 $ 249  
$131 million, 6.35% Notes due 2018 [Member] | Uncollateralized Debt [Member]      
Debt Instrument [Line Items]      
Long-term debt, face value $ 131 $ 131  
Long-term debt, stated interest rate 6.35% 6.35%  
Long-term debt, carrying value $ 131 $ 131  
$250 million, 4.375% Notes due 2020 [Member] | Uncollateralized Debt [Member]      
Debt Instrument [Line Items]      
Long-term debt, face value $ 250 $ 250  
Long-term debt, stated interest rate 4.375% 4.375%  
Long-term debt, carrying value [1] $ 252 $ 254  
$300 million, 5.125% Notes due 2020 [Member] | Uncollateralized Debt [Member]      
Debt Instrument [Line Items]      
Long-term debt, face value $ 300 $ 300  
Long-term debt, stated interest rate 5.125% 5.125%  
Long-term debt, carrying value [1] $ 301 $ 303  
$78 million, 6.37% Notes due 2021 [Member] | Uncollateralized Debt [Member]      
Debt Instrument [Line Items]      
Long-term debt, face value $ 78 $ 78  
Long-term debt, stated interest rate 6.37% 6.37%  
Long-term debt, carrying value $ 78 $ 78  
$300 million, 4.5% Notes due 2021 [Member] | Uncollateralized Debt [Member]      
Debt Instrument [Line Items]      
Long-term debt, face value $ 300 $ 300  
Long-term debt, stated interest rate 4.50% 4.50%  
Long-term debt, carrying value [1] $ 302 $ 304  
$750 million, 4% Notes due 2022 [Member] | Uncollateralized Debt [Member]      
Debt Instrument [Line Items]      
Long-term debt, face value $ 750 $ 750  
Long-term debt, stated interest rate 4.00% 4.00%  
Long-term debt, carrying value $ 744 $ 743  
$100 million, 7.65% Notes due 2023 [Member] | Uncollateralized Debt [Member]      
Debt Instrument [Line Items]      
Long-term debt, face value $ 100 $ 100  
Long-term debt, stated interest rate 7.65% 7.65%  
Long-term debt, carrying value $ 100 $ 100  
$17 million, 8.3% Notes due 2023 [Member] | Uncollateralized Debt [Member]      
Debt Instrument [Line Items]      
Long-term debt, face value $ 17 $ 17  
Long-term debt, stated interest rate 8.30% 8.30%  
Long-term debt, carrying value $ 17 $ 17  
$900 million, 3.25% Notes Due 2025 [Member] | Uncollateralized Debt [Member]      
Debt Instrument [Line Items]      
Long-term debt, issuance date Mar. 11, 2015    
Long-term debt, face value $ 900 900  
Long-term debt, term 10 years    
Long-term debt, maturity date Apr. 15, 2025    
Long-term debt, stated interest rate 3.25%    
Long-term debt, carrying value $ 893 892 $ 892
Effective interest rate     3.36%
Percentage of principal amount to be paid upon redemption 100.00%    
Basis points added to Treasury rate used in debt redemption discount calculation 0.175%    
$300 million, 7.875% Debentures due 2027 [Member] | Uncollateralized Debt [Member]      
Debt Instrument [Line Items]      
Long-term debt, face value $ 300 $ 300  
Long-term debt, stated interest rate 7.875% 7.875%  
Long-term debt, carrying value $ 299 $ 299  
$83 million, 8.3% Step Down Notes due 2033 [Member] | Uncollateralized Debt [Member]      
Debt Instrument [Line Items]      
Long-term debt, face value $ 83 $ 83  
Long-term debt, stated interest rate 8.30% 8.30%  
Long-term debt, carrying value $ 82 $ 82  
$500 million, 6.15% Notes due 2036 [Member] | Uncollateralized Debt [Member]      
Debt Instrument [Line Items]      
Long-term debt, face value $ 500 $ 500  
Long-term debt, stated interest rate 6.15% 6.15%  
Long-term debt, carrying value $ 498 $ 498  
$300 million, 5.875% Notes due 2041 [Member] | Uncollateralized Debt [Member]      
Debt Instrument [Line Items]      
Long-term debt, face value $ 300 $ 300  
Long-term debt, stated interest rate 5.875% 5.875%  
Long-term debt, carrying value $ 296 $ 295  
$750 million, 5.375% Notes due 2042 [Member] | Uncollateralized Debt [Member]      
Debt Instrument [Line Items]      
Long-term debt, face value $ 750 $ 750  
Long-term debt, stated interest rate 5.375% 5.375%  
Long-term debt, carrying value $ 743 $ 743  
Other, including capital leases [Member] | Uncollateralized Debt [Member]      
Debt Instrument [Line Items]      
Long-term debt, carrying value $ 20 $ 32  
[1] The Company has entered into interest rate swap contracts hedging a portion of these fixed-rate debt instruments. See Note 12 for further information about the Company’s interest rate risk management and these derivative instruments.