Equity (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended
		May 03, 2017	Mar. 31, 2017	Mar. 31, 2016
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Balance as of beginning of period			$ 20,854	$ 21,354
Net income			321	513
Dividends			(315)	(282)
Stock-based compensation expense			13	12
Distributions to noncontrolling interests			(34)	(7)
Other			38	13
Other comprehensive income			76	132
Balance as of end of period			20,651	21,495
Dividend Declared [Member] | Subsequent Event [Member]
Equity (Textual)
Dividends payable, date declared		May 03, 2017
Dividends payable, amount per share		$ 0.70
Dividends payable, date to be paid		Jun. 07, 2017
Dividends payable, date of record		May 17, 2017
Stock-Based Compensation Plans Purchase Program [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Stock purchases			(10)	(42)
Common Stock Purchase Program [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Stock purchases			(292)	(198)
Parent [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Balance as of beginning of period			20,024	20,527
Net income			305	495
Dividends			(315)	(282)
Stock-based compensation expense			13	12
Distributions to noncontrolling interests			0	0
Other			24	13
Other comprehensive income			76	131
Balance as of end of period			19,825	20,656
Parent [Member] | Stock-Based Compensation Plans Purchase Program [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Stock purchases			(10)	(42)
Parent [Member] | Common Stock Purchase Program [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Stock purchases			(292)	(198)
Noncontrolling Interests [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Balance as of beginning of period	[1]		830	827
Net income	[1]		16	18
Distributions to noncontrolling interests	[1]		(34)	(7)
Other	[1]		14	0
Other comprehensive income	[1]		0	1
Balance as of end of period	[1]		$ 826	$ 839

[1] The noncontrolling interests relate to third-party ownership interests in VIEs for which we are the primary beneficiary and therefore consolidate. See Note 6 for information about our consolidated VIEs.