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Debt and Equity Transactions (Unaudited) Early Extinguishment of debt (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 05, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Write off of Deferred Debt Issuance Cost |  | $ 2 |  |  |  |  |
Extinguishment of Debt, Amount |  | 266 |  |  |  |  |
Net gain on early extinguishment of debt |  | 39 |  | $ 0 | $ 36 | $ 0 |
Senior Notes [Member] |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Extinguishment of Debt, Principal Amount |  | 268 |  |  |  |  |
Extinguishment of Debt, Amount |  | 268 |  |  |  |  |
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 |  | 81 |  |  |  |  |
Write off of Deferred Debt Issuance Cost |  | 1 |  |  |  |  |
Extinguishment of Debt, Amount |  | 80 |  |  |  |  |
Net gain on early extinguishment of debt |  | 16 |  |  |  |  |
3.55% Senior Notes due 2022 | Senior Notes [Member] |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Extinguishment of Debt, Principal Amount |  | 85 |  |  |  |  |
Write off of Deferred Debt Issuance Cost |  | 0 |  |  |  |  |
Extinguishment of Debt, Amount |  | 85 |  |  |  |  |
Net gain on early extinguishment of debt |  | 9 |  |  |  |  |
3.875% Senior Notes due March 2023 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Extinguishment of Debt, Principal Amount |  | 52 |  |  |  |  |
Write off of Deferred Debt Issuance Cost |  | 0 |  |  |  |  |
Extinguishment of Debt, Amount |  | 52 |  |  |  |  |
Net gain on early extinguishment of debt |  | 6 |  |  |  |  |
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 |  |  |  |  |
Net gain on early extinguishment of debt |  | $ 8 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross | $ 32 |  |  |  |  |  | $ 2,000

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