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Debt (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Mar. 31, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |
Short-term borrowings | $ 0 |  | $ 0 |  | $ 0
Reported Value Measurement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | 13,900,000,000 |  | 13,900,000,000 |  | 12,800,000,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | 16,100,000,000 |  | 16,100,000,000 |  | $ 14,500,000,000
Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes purchased | 933,000,000 | $ 793,000,000 | $ 933,000,000 | $ 793,000,000 |
Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percentage of aggregate principal to be repaid |  |  | 101.00% |  |
Senior Notes [Member] | Senior Unsecured Long Term Notes Due 2026 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount | $ 500,000,000.0 |  | $ 500,000,000.0 |  |
Interest rate | 2.625% |  | 2.625% |  |
Senior Notes [Member] | Senior Unsecured Long Term Notes Due 2046 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount | $ 1,500,000,000.0 |  | $ 1,500,000,000.0 |  |
Interest rate | 3.875% |  | 3.875% |  |
Senior Notes [Member] | Notes Issued, 2008 and 2009 [Member] | Subject to Credit Rating Step Up [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount | $ 2,500,000,000.0 |  | $ 2,500,000,000.0 |  |

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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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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 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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