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Debt Level 4 (Details) - USD ($) | 12 Months Ended | 240 Months Ended | 600 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Apr. 15, 2042 | Jun. 15, 2068 | Oct. 17, 2016
Schedule of Debt [Line Items] |  |  |  |  |  |
Senior Notes | $ 416,000,000 |  |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |
Long-term Line of Credit | 0 | $ 0 |  |  |  |
Notes Payable | 5,174,000,000 | 5,449,000,000 |  |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | (122,000,000) | (90,000,000) |  |  |  |
Long-term Debt, Excluding Current Maturities | 4,636,000,000 | 5,084,000,000 |  |  |  |
Current maturity adjustment to long-term debt | (416,000,000) | (275,000,000) |  |  |  |
Debt, Long-term and Short-term, Combined Amount | 5,052,000,000 | 5,359,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Interest Expense | 339,000,000 | 357,000,000 | $ 376,000,000 |  |  |
Financial Instruments Owned and Pledged as Collateral, Amount Eligible to be Repledged by Counterparty | 1,100,000,000 |  |  |  |  |
Maximum Aggregate Principal Amount of Junior Subordinated Notes | 500,000,000 |  |  |  |  |
Loss on extinguishment of debt | 0 | (21,000,000) | $ 0 |  |  |
Long-term Federal Home Loan Bank Advances | 0 |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Commercial Paper | 1,000,000,000 |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 320,000,000 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 413,000,000 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 500,000,000 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 0 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five | 3,525,000,000 |  |  |  |  |
Commercial Paper, Outstanding | 0 |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  | $ 275,000,000
Five Year Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 1,000,000,000 |  |  |  |  |
Borrowings [Member] |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Line of Credit Facility, Maximum Amount Outstanding During Period | 0 |  |  |  |  |
Senior Note Five Point Three Seven Five Due in Two Thousand Seventeen [Member] |  |  |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |
Senior Notes | 416,000,000 |  |  |  |  |
Senior Note Five Point Five Percent Due in Two Thousand Sixteen [Member] |  |  |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |
Senior Notes | $ 0 |  |  |  |  |
Revolving Credit Facility [Member] | Four Year Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Line of Credit, Term of Credit Facility | 4 years |  |  |  |  |
Revolving Credit Facility [Member] | Five Year Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Line of Credit, Term of Credit Facility | 5 years |  |  |  |  |
Senior Note Four Point Zero Percent Due in Two Thousand Fifteen [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.00% |  |  |  |  |
Senior Note Seven Point Three Percent Due in Two Thousand Fifteen [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.30% |  |  |  |  |
Senior Note Five Point Five Percent Due in Two Thousand Sixteen [Member] |  |  |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |
Senior Notes |  | 275,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.50% |  |  |  |  |
Senior Note Five Point Three Seven Five Due in Two Thousand Seventeen [Member] |  |  |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |
Senior Notes |  | 416,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.375% |  |  |  |  |
Senior Note 4.0% Due 2017 [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.00% |  |  |  |  |
Senior Note 6.3% Due 2018 [Member] |  |  |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |
Senior Notes | $ 320,000,000 | 320,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.30% |  |  |  |  |
Senior Note 6.0% Due 2019 [Member] |  |  |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |
Senior Notes | $ 413,000,000 | 413,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.00% |  |  |  |  |
Senior Note 5.5% Due 2020 [Member] |  |  |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |
Senior Notes | $ 500,000,000 | 500,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.50% |  |  |  |  |
Senior Note 5.125% Due 2022 [Member] |  |  |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |
Senior Notes | $ 800,000,000 | 800,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.125% |  |  |  |  |
Senior Note 7.65% Due 2027 [Member] |  |  |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |
Senior Notes | $ 80,000,000 | 80,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.65% |  |  |  |  |
Senior Note 7.375% Due 2031 [Member] |  |  |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |
Senior Notes | $ 63,000,000 | 63,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.375% |  |  |  |  |
Senior Note 5.95% Due 2036 [Member] |  |  |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |
Senior Notes | $ 300,000,000 | 300,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.95% |  |  |  |  |
Senior Note 6.625% Due 2040 [Member] |  |  |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |
Senior Notes | $ 295,000,000 | 295,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.625% |  |  |  |  |
Senior Note 6.1% Due 2041 [Member] |  |  |  |  |  |
Schedule of Debt [Line Items] |  |  |  |  |  |
Debt Issuance Costs, Gross | $ 83,000,000 | 81,000,000 |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |
Senior Notes | $ 409,000,000 | 409,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.10% |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 7.90% |  |  |  |  |
Senior Note 6.625% Due 2042 [Member] |  |  |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |
Senior Notes | $ 178,000,000 | 178,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.625% |  |  |  |  |
Senior Note 4.3% Due in 2043 [Member] |  |  |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |
Senior Notes | $ 300,000,000 | 300,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.30% |  |  |  |  |
7.875% Notes, due 2042 [Member] |  |  |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |
Junior Subordinated Notes | $ 600,000,000 | 600,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.875% |  |  |  |  |
8.125% Notes, due 2068 [Member] |  |  |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |
Junior Subordinated Notes | $ 500,000,000 | $ 500,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.125% |  |  |  |  |
Scenario, Forecast [Member] | 7.875% Notes, due 2042 [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate Terms |  |  |  | 3 Month LIBOR + 5.596% |  |
Scenario, Forecast [Member] | 8.125% Notes, due 2068 [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate Terms |  |  |  |  | 3 Month LIBOR + 4.6025% |

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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + References Reference 1: 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)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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