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Equity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Balance as of beginning of period	$ 21,354	$ 21,244
Net income	513	968
Dividends	(282)	(206)
Stock-based compensation expense	12	9
Tax deduction in excess of stock-based compensation expense	10	15
Transactions in connection with stock-based compensation plans:
Stock issuances	3	15
Contributions from noncontrolling interests	0	2
Distributions to noncontrolling interests	(7)	(5)
Other comprehensive income (loss)	132	(363)
Balance as of end of period	21,495	21,342
Stock-Based Compensation Plans Purchase Program [Member]
Transactions in connection with stock-based compensation plans:
Stock purchases	(42)	(50)
Common Stock Purchase Program [Member]
Transactions in connection with stock-based compensation plans:
Stock purchases	(198)	(287)
Parent [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Balance as of beginning of period	20,527	20,677
Net income	495	964
Dividends	(282)	(206)
Stock-based compensation expense	12	9
Tax deduction in excess of stock-based compensation expense	10	15
Transactions in connection with stock-based compensation plans:
Stock issuances	3	15
Contributions from noncontrolling interests	0	0
Distributions to noncontrolling interests	0	0
Other comprehensive income (loss)	131	(363)
Balance as of end of period	20,656	20,774
Parent [Member] | Stock-Based Compensation Plans Purchase Program [Member]
Transactions in connection with stock-based compensation plans:
Stock purchases	(42)	(50)
Parent [Member] | Common Stock Purchase Program [Member]
Transactions in connection with stock-based compensation plans:
Stock purchases	(198)	(287)
Noncontrolling Interest [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Balance as of beginning of period	827	567
Net income	18	4
Transactions in connection with stock-based compensation plans:
Contributions from noncontrolling interests	0	2
Distributions to noncontrolling interests	(7)	(5)
Other comprehensive income (loss)	1	0
Balance as of end of period	$ 839	$ 568

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- Definition

Amount of increase (decrease) in additional paid in capital (APIC) resulting from a tax benefit (deficiency) associated with an share-based compensation plan other than an employee stock ownership plan (ESOP).

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This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

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Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Gross value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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Stock Issued or Repurchased During Period, Value, Share-based Compensation [Abstract]

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