Financial Statement Schedule (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowances for Doubtful Accounts
Movement in Valuation Allowances and Reserves
Balance at Beginning of Period	$ 97	$ 81	$ 63
Charged/ Credited to Net Income	79	132	109
Charged to Other Account	0	0	0
Charges Utilized/ Write-offs	(134)	(116)	(91)
Balance at End of Period	42	97	81
Allowance for Authorized Credits
Movement in Valuation Allowances and Reserves
Balance at Beginning of Period	39	28	31
Charged/ Credited to Net Income	(8)	11	(3)
Charged to Other Account	0	0	0
Charges Utilized/ Write-offs	1	0	0
Balance at End of Period	32	39	28
Allowance for Transaction Losses
Movement in Valuation Allowances and Reserves
Balance at Beginning of Period	32	23	23
Charged/ Credited to Net Income	343	198	153
Charged to Other Account	0	0	0
Charges Utilized/ Write-offs	(287)	(189)	(153)
Balance at End of Period	88	32	23
Tax Valuation Allowance
Movement in Valuation Allowances and Reserves
Balance at Beginning of Period	149	96	62
Charged/ Credited to Net Income	6	53	42
Charged to Other Account	(12)	0	(1)
Charges Utilized/ Write-offs	(7)	0	(7)
Balance at End of Period	$ 136	$ 149	$ 96