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Long-Term Debt (Narrative) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |
Debt issuance costs | $ 77,000,000 |  |  |
Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Extinguishment of debt | $ 933,000,000 | $ 793,000,000 |  |
Senior Notes [Member] | UST [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate |  |  |  | 5.75%
Debt redeemed |  |  |  | $ 300,000,000
Senior Notes [Member] | Change Of Control And Loss Of Investment Grade Rating [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Required purchase price as percentage of aggregate principal amount | 101.00% |  |  |
Senior Unsecured Long Term Notes Due 2026 [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  |  | $ 500,000,000.0 |
Stated interest rate |  |  | 2.625% |
Senior Unsecured Long Term Notes Due 2046 [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  |  | $ 1,500,000,000.0 |
Stated interest rate |  |  | 3.875% |
Notes Issued, 2008 and 2009 [Member] | Senior Notes [Member] | Subject to Credit Rating Step Up [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount | $ 2,500,000,000.0 |  |  |
Reported Value Measurement [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fair value of long term debt | 13,900,000,000 | 12,800,000,000 |  |
Level 2 [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fair value of long term debt | $ 15,100,000,000 | 14,500,000,000 |  |
Other Assets [Member] | Accounting Standards Update 2015-03 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuance costs |  | (72,000,000) |  |
Long-term Debt [Member] | Accounting Standards Update 2015-03 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuance costs |  | $ 72,000,000 |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + 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=6479336&loc=d3e64711-112823 + Details
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- Definition Amount, after 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 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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