The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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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
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Topic 835
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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))
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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.

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- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
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- Definition

Represents the charge against earnings during the period for commitment fees and debt issuance expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
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Financing arrangements (Debt Exchange) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2015
Debt Instrument [Line Items]
Aggregate principal amount of notes issued	$ 6,700	$ 4,500	$ 3,500
4.563% notes due 2048 (4.563% 2048 Notes) [Member]
Debt Instrument [Line Items]
Stated contractual interest rate on note		4.563%
4.663% notes due 2051 (4.663% 2051 Notes) [Member]
Debt Instrument [Line Items]
Stated contractual interest rate on note		4.663%
6.375% notes due 2037 (6.375% 2037 Notes) [Member]
Debt Instrument [Line Items]
Stated contractual interest rate on note		6.375%
6.90% notes due 2038 (6.90% 2038 Notes) [Member]
Debt Instrument [Line Items]
Stated contractual interest rate on note		6.90%
6.40% notes due 2039 (6.40% 2039 Notes) [Member]
Debt Instrument [Line Items]
Stated contractual interest rate on note		6.40%
5.75% notes due 2040 (5.75% 2040 Notes) [Member]
Debt Instrument [Line Items]
Stated contractual interest rate on note		5.75%
5.15% notes due 2041 (5.15% 2041 Notes) [Member]
Debt Instrument [Line Items]
Stated contractual interest rate on note		5.15%
5.65% notes due 2042 (5.65% 2042 Notes) [Member]
Debt Instrument [Line Items]
Stated contractual interest rate on note		5.65%
5.375% notes due 2043 (5.375% 2043 Notes) [Member]
Debt Instrument [Line Items]
Stated contractual interest rate on note		5.375%
Senior notes [Member] \| 4.563% notes due 2048 (4.563% 2048 Notes) [Member]
Debt Instrument [Line Items]
Aggregate principal amount of notes issued	$ 1,400
Stated contractual interest rate on note	4.563%
Senior notes [Member] \| 4.663% notes due 2051 (4.663% 2051 Notes) [Member]
Debt Instrument [Line Items]
Aggregate principal amount of notes issued	$ 3,500
Stated contractual interest rate on note	4.663%
Debt Securities Payable [Member]
Debt Instrument [Line Items]
Unamortized bond discounts and issuance costs	$ 936	$ 929
Debt Securities Payable [Member] \| 6.375% notes due 2037 (6.375% 2037 Notes) [Member]
Debt Instrument [Line Items]
Debt conversion, converted instrument, amount	348
Debt Securities Payable [Member] \| 6.90% notes due 2038 (6.90% 2038 Notes) [Member]
Debt Instrument [Line Items]
Debt conversion, converted instrument, amount	209
Debt Securities Payable [Member] \| 6.40% notes due 2039 (6.40% 2039 Notes) [Member]
Debt Instrument [Line Items]
Debt conversion, converted instrument, amount	534
Debt Securities Payable [Member] \| 5.75% notes due 2040 (5.75% 2040 Notes) [Member]
Debt Instrument [Line Items]
Debt conversion, converted instrument, amount	288
Debt Securities Payable [Member] \| 5.15% notes due 2041 (5.15% 2041 Notes) [Member]
Debt Instrument [Line Items]
Debt conversion, converted instrument, amount	1,276
Debt Securities Payable [Member] \| 5.65% notes due 2042 (5.65% 2042 Notes) [Member]
Debt Instrument [Line Items]
Debt conversion, converted instrument, amount	763
Debt Securities Payable [Member] \| 5.375% notes due 2043 (5.375% 2043 Notes) [Member]
Debt Instrument [Line Items]
Debt conversion, converted instrument, amount	739
Nonoperating Income (Expense) [Member] \| Debt Securities Payable [Member] \| New senior notes [Member]
Debt Instrument [Line Items]
Unamortized bond discounts and issuance costs	801
Debt related commitment fees and debt issuance costs	$ 24