Other (Income)/Deductions - Net - Footnotes - Investments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investment Holdings [Line Items]
Available-for-sale securities, gross realized gains (losses), sale proceeds	$ 10,200	$ 4,300	$ 10,200
Debt Securities [Member]
Investment Holdings [Line Items]
Available-for-sale securities, gross realized gains	666		138
Available-for-sale securities, gross realized losses	548	960	436
Private Equity Funds [Member]
Investment Holdings [Line Items]
Gain on sale of investments	2	3	39
Equity Securities [Member]
Investment Holdings [Line Items]
Available-for-sale securities, gross realized gains		164	76
Foreign Exchange Contract [Member] \| Designated as Hedging Instrument [Member] \| Debt Securities [Member]
Investment Holdings [Line Items]
Gain (loss) on derivative instruments, net, pretax	(64)	937	323
Distribution Rights [Member]
Investment Holdings [Line Items]
Gain on disposition of intangible assets	$ 84	$ 90	$ 135

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563

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The total amount of proceeds received for the sale of securities, categorized neither as held-to-maturity nor trading securities, during the reporting period.

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This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959

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Amount of gain (loss) on sale or disposal of intangible assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7,9)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale.

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