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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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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.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Description of Business and Accounting Policies - Accounting Pronouncements Recently Adopted (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2018	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by (used in) operating activities	$ 30,723	$ 18,365	$ 17,203
Net Cash Provided by (Used in) Investing Activities	(12,369)	(27,084)	(9,516)
Net cash provided by (used in) financing activities	(7,686)	9,928	(3,716)
Net change in cash, cash equivalents, and restricted cash		1,209	3,971
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets					$ 650
Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets				$ 250
Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by (used in) operating activities		18,434	17,272
Net Cash Provided by (Used in) Investing Activities		(27,819)	(9,876)
Net cash provided by (used in) financing activities		9,860	(3,740)
Net change in cash, cash equivalents, and restricted cash		475	3,656
Restatement Adjustment [Member] \| Accounting Standards Update 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by (used in) operating activities		(69)	(69)
Net Cash Provided by (Used in) Investing Activities		735	360
Net cash provided by (used in) financing activities		68	24
Net change in cash, cash equivalents, and restricted cash		$ 734	$ 315
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] \| Service, Subscription [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Sales	3,800
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] \| Product, Subscription [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Sales	(3,800)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] \| Service, Other [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Sales	$ 3,000