Equity (Details) - USD ($)		1 Months Ended		3 Months Ended		6 Months Ended
	Jul. 13, 2015	Jul. 31, 2015	Jul. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Balance as of beginning of period		$ 22,006,000,000	$ 20,720,000,000			$ 21,244,000,000	$ 19,946,000,000
Net income				$ 1,365,000,000	$ 593,000,000	2,333,000,000	1,429,000,000
Dividends						(409,000,000)	(266,000,000)
Stock-based compensation expense						18,000,000	21,000,000
Tax deduction in excess of stock-based compensation expense						27,000,000	31,000,000
Transactions in connection with stock-based compensation plans:
Stock issuances						20,000,000	32,000,000
Contributions from noncontrolling interests						2,000,000	14,000,000
Distributions to noncontrolling interests						(34,000,000)	(4,000,000)
Other comprehensive income (loss)				201,000,000	149,000,000	(162,000,000)	76,000,000
Balance as of end of period				22,006,000,000	20,720,000,000	22,006,000,000	20,720,000,000
Equity (Textual)
Stock purchases, in shares			2,000,000
Subsequent Event [Member]
Equity (Textual)
Stock purchases, in shares		675,000
Subsequent Event [Member] | Dividend Declared [Member]
Equity (Textual)
Dividends payable, date declared	Jul. 13, 2015
Dividends payable, amount per share	$ 0.40
Dividends payable, date to be paid	Sep. 02, 2015
Dividends payable, date of record	Aug. 04, 2015
Stock-Based Compensation Plans Repurchase Program [Member]
Transactions in connection with stock-based compensation plans:
Stock purchases						(105,000,000)	(76,000,000)
Equity (Textual)
Stock purchases						105,000,000	76,000,000
Common Stock Repurchase Program [Member]
Transactions in connection with stock-based compensation plans:
Stock purchases						(928,000,000)	(483,000,000)
Equity (Textual)
Stock purchases						$ 928,000,000	$ 483,000,000
$2.5 Billion Program Approved July 2015 [Member] | Subsequent Event [Member]
Equity (Textual)
Authorized amount under stock purchase program	$ 2,500,000,000.0
Treasury Stock [Member] | Stock-Based Compensation Plans Repurchase Program [Member]
Equity (Textual)
Stock purchases, in shares						2,000,000	1,000,000
Treasury Stock [Member] | Common Stock Repurchase Program [Member]
Equity (Textual)
Stock purchases, in shares						15,000,000	7,000,000
Parent [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Balance as of beginning of period		$ 21,453,000,000	$ 20,211,000,000			$ 20,677,000,000	$ 19,460,000,000
Net income						2,315,000,000	1,416,000,000
Dividends						(409,000,000)	(266,000,000)
Stock-based compensation expense						18,000,000	21,000,000
Tax deduction in excess of stock-based compensation expense						27,000,000	31,000,000
Transactions in connection with stock-based compensation plans:
Stock issuances						20,000,000	32,000,000
Contributions from noncontrolling interests						0	0
Distributions to noncontrolling interests						0	0
Other comprehensive income (loss)						(162,000,000)	76,000,000
Balance as of end of period				21,453,000,000	20,211,000,000	21,453,000,000	20,211,000,000
Parent [Member] | Stock-Based Compensation Plans Repurchase Program [Member]
Transactions in connection with stock-based compensation plans:
Stock purchases						(105,000,000)	(76,000,000)
Equity (Textual)
Stock purchases						105,000,000	76,000,000
Parent [Member] | Common Stock Repurchase Program [Member]
Transactions in connection with stock-based compensation plans:
Stock purchases						(928,000,000)	(483,000,000)
Equity (Textual)
Stock purchases						928,000,000	483,000,000
Noncontrolling Interest [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Balance as of beginning of period		$ 553,000,000	$ 509,000,000			567,000,000	486,000,000
Net income						18,000,000	13,000,000
Transactions in connection with stock-based compensation plans:
Contributions from noncontrolling interests						2,000,000	14,000,000
Distributions to noncontrolling interests						(34,000,000)	(4,000,000)
Other comprehensive income (loss)						0	0
Balance as of end of period				$ 553,000,000	$ 509,000,000	$ 553,000,000	$ 509,000,000