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Debt (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Jul. 21, 2015
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  |  | $ 10,942,000,000 | $ 12,384,000,000 |
Long-term debt |  |  | 10,430,000,000 | 12,214,000,000 |
Debt Instrument, Unamortized Discount |  |  | $ (98,000,000) | (110,000,000) |
Debt instrument call feature description |  |  | We may redeem all of our senior notes from time to time or all of the notes of each series at any time at the applicable redemption prices, plus accrued and unpaid interest. |  |
Early Repayment of Senior Debt |  | $ 1,400,000,000 |  |  |
Gain (Loss) on Extinguishment of Debt |  |  | $ 104,000,000 |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | $ 3,000,000,000
Long-term Debt, Current Maturities |  |  | 440,000,000 |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | 3,000,000,000 | 3,000,000,000 |
Short-term borrowings and current maturities of long-term debt |  |  | 512,000,000 | 170,000,000 |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  |  | 30,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  |  | 26,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four |  |  | 709,000,000 |  |
Long-term Debt, Maturities Repayments of Principal in Year Five |  |  | 14,000,000 |  |
Senior notes due November 2045 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | $ 2,000,000,000 | $ 2,000,000,000 |
Interest rate (in hundredths) |  |  | 5.00% | 5.00% |
Maturity date |  |  | November 2045 | November 2045 |
Senior Notes due November 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | $ 2,000,000,000 | $ 2,000,000,000 |
Interest rate (in hundredths) |  |  | 3.80% | 3.80% |
Maturity date |  |  | November 2025 | November 2025 |
Senior notes due August 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | $ 1,100,000,000 | $ 1,100,000,000 |
Interest rate (in hundredths) |  |  | 3.50% | 3.50% |
Maturity date |  |  | August 2023 | August 2023 |
Senior Notes due November 2035 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | $ 1,000,000,000 | $ 1,000,000,000 |
Interest rate (in hundredths) |  |  | 4.85% | 4.85% |
Maturity date |  |  | November 2035 | November 2035 |
Senior notes due September 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  | 1,000,000,000 | $ 0 | $ 1,000,000,000 |
Interest rate (in hundredths) |  |  | 6.15% | 6.15% |
Maturity date |  |  | September 2019 | September 2019 |
Senior notes due September 2039 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | $ 1,000,000,000 | $ 1,000,000,000 |
Interest rate (in hundredths) |  |  | 7.45% | 7.45% |
Maturity date |  |  | September 2039 | September 2039 |
Senior notes due August 2043 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | $ 900,000,000 | $ 900,000,000 |
Interest rate (in hundredths) |  |  | 4.75% | 4.75% |
Maturity date |  |  | August 2043 | August 2043 |
Senior notes due September 2038 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | $ 800,000,000 | $ 800,000,000 |
Interest rate (in hundredths) |  |  | 6.70% | 6.70% |
Maturity date |  |  | September 2038 | September 2038 |
Senior notes due November 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | $ 500,000,000 | $ 500,000,000 |
Interest rate (in hundredths) |  |  | 3.25% | 3.25% |
Maturity date |  |  | November 2021 | November 2021 |
Senior notes due November 2041 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | $ 500,000,000 | $ 500,000,000 |
Interest rate (in hundredths) |  |  | 4.50% | 4.50% |
Maturity date |  |  | November 2041 | November 2041 |
Senior notes due August 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | $ 400,000,000 | $ 400,000,000 |
Interest rate (in hundredths) |  |  | 2.00% | 2.00% |
Maturity date |  |  | August 2018 | August 2018 |
Senior notes due September 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  | $ 400,000,000 | $ 0 | $ 400,000,000 |
Interest rate (in hundredths) |  |  | 5.90% | 5.90% |
Maturity date |  |  | September 2018 | September 2018 |
Senior debentures due August 2096 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | $ 300,000,000 | $ 300,000,000 |
Interest rate (in hundredths) |  |  | 7.60% | 7.60% |
Debt instruments non-call feature description |  |  | may not be redeemed prior to maturity |  |
Maturity date |  |  | August 2096 | August 2096 |
Senior debentures due February 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | $ 185,000,000 | $ 185,000,000 |
Interest rate (in hundredths) |  |  | 8.75% | 8.75% |
Maturity date |  |  | February 2021 | February 2021 |
Senior notes due February 2027 [Member] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | $ 104,000,000 | $ 104,000,000 |
Interest rate (in hundredths) |  |  | 6.75% | 6.75% |
Maturity date |  |  | February 2027 | February 2027 |
Senior notes due May 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | $ 0 | $ 45,000,000 |
Interest rate (in hundredths) |  |  | 7.53% | 7.53% |
Repayments of Senior Debt | $ 45,000,000 |  |  |  |
Maturity date |  |  | May 2017 | May 2017 |
Other Debt Obligations [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | $ 251,000,000 | $ 260,000,000 |

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- Definition Description of a feature that permits the issuer of the debt to repay or convert it before the stated maturity date (early retirement date). The description may include such items as the call price, the period that the issuer can call the debt, including the earliest call date, and other significant terms of the call feature, which may include the debt holders' ability to convert the debt to equity if the call option is exercised and contingent events that trigger the issuer's ability to call the debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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