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Debt and Equity Transactions (Unaudited) Early Extinguishment of debt (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jan. 05, 2016
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Extinguishment of Debt [Line Items]                
Proceeds from Issuance of Common Stock, Gross   $ 415     $ 311 $ 1,500   $ 2,000
Write off of Deferred Debt Issuance Cost         4      
Extinguishment of Debt, Amount         365      
Extinguishment Of Debt, Redemption Value         311      
Net gain on early extinguishment of debt   $ 15   $ 0 54 $ 51 $ 0  
Senior Notes [Member]                
Extinguishment of Debt [Line Items]                
Extinguishment of Debt, Principal Amount         369      
Extinguishment of Debt, Amount         369      
Revolving Credit Facility [Member]                
Extinguishment of Debt [Line Items]                
Net gain on early extinguishment of debt     $ 3          
5.450% Senior Notes due March 2043 [Member] | Senior Notes [Member]                
Extinguishment of Debt [Line Items]                
Extinguishment of Debt, Principal Amount         134      
Write off of Deferred Debt Issuance Cost         2      
Extinguishment of Debt, Amount         132      
Extinguishment Of Debt, Redemption Value         106      
Net gain on early extinguishment of debt         26      
3.55% Senior Notes due 2022 | Senior Notes [Member]                
Extinguishment of Debt [Line Items]                
Extinguishment of Debt, Principal Amount         108      
Write off of Deferred Debt Issuance Cost         1      
Extinguishment of Debt, Amount         107      
Extinguishment Of Debt, Redemption Value         96      
Net gain on early extinguishment of debt         11      
3.875% Senior Notes due March 2023 [Member] | Senior Notes [Member]                
Extinguishment of Debt [Line Items]                
Extinguishment of Debt, Principal Amount         77      
Write off of Deferred Debt Issuance Cost         0      
Extinguishment of Debt, Amount         77      
Extinguishment Of Debt, Redemption Value         68      
Net gain on early extinguishment of debt         9      
5.40% Senior Notes Due 2034 [Member] [Member] | Senior Notes [Member]                
Extinguishment of Debt [Line Items]                
Extinguishment of Debt, Principal Amount         50      
Write off of Deferred Debt Issuance Cost         1      
Extinguishment of Debt, Amount         49      
Extinguishment Of Debt, Redemption Value         41      
Net gain on early extinguishment of debt         $ 8      
Common Stock [Member]                
Extinguishment of Debt [Line Items]                
Proceeds from Issuance of Common Stock, Gross $ 32