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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 |  |  |  |  |  |  |

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