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Debt - Short-term and Long-term Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Commercial paper $ 100 $ 100
Other, including capital leases 49 47
Total short-term debt 149 147
Long-term debt, carrying value 5,020 4,979
$600 million, 2.75% Notes due 2016 [Member] | Uncollateralized Debt [Member]    
Debt Instrument [Line Items]    
Long-term debt, face value $ 600 $ 600
Long-term debt, stated interest rate 2.75% 2.75%
Long-term debt, carrying value $ 0 $ 598 [1]
$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 $ 249 $ 249 [1]
$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 [1]
$251 million, 8.5% Notes due 2019 [Member] | Uncollateralized Debt [Member]    
Debt Instrument [Line Items]    
Long-term debt, face value $ 251 $ 251
Long-term debt, stated interest rate 8.50% 8.50%
Long-term debt, carrying value $ 0 $ 250 [1]
$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 [2] $ 254 $ 253 [1]
$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 [2] $ 303 $ 302 [1]
$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 [1]
$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 [2] $ 304 $ 301 [1]
$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 $ 743 $ 741 [1]
$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 [1]
$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 [1]
$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  
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 $ 892 0
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 $ 298 [1]
$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 [1]
$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 [1]
$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 $ 295 $ 295 [1]
$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 [1]
Other, including capital leases [Member] | Uncollateralized Debt [Member]    
Debt Instrument [Line Items]    
Long-term debt, carrying value $ 32 $ 43 [1]
[1] As explained in Note 2(B), in the fourth quarter of 2015, the Company retrospectively adopted ASU 2015-03 that requires debt issuance costs to be netted against the carrying value of the debt. Amounts presented above for 2014 have been retrospectively adjusted to conform to the new guidance. The impact on 2014 balances was not material.
[2] 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.