Financial Statement Schedule (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts, Current [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 89	$ 87	$ 86
Charged/Credited to Net Income	249	177	135
Charged to Other Accounts	0	0	0
Charges Utilized/Write-offs	(232)	(175)	(134)
Balance at End of Period	106	89	87
Allowance for Trasaction, Loan and Interest Losses [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	228	193	137
Charged/Credited to Net Income	805	573	482
Charged to Other Accounts	0	0	0
Charges Utilized/Write-offs	(726)	(538)	(426)
Balance at End of Period	307	228	193
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	169	83	43
Charged/Credited to Net Income	35	16	33
Charged to Other Accounts	(2)	78	0
Charges Utilized/Write-offs	(16)	(8)	7
Balance at End of Period	$ 186	$ 169	$ 83