Receivables (Details 7) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Average balance of TDR Loans:
Total average balance of TDR Loans	$ 16,376	$ 9,721	$ 16,285	$ 9,813
Interest income recognized on TDR Loans:
Total interest income recognized on TDR Loans	299	125	538	242
First lien [Member]
Average balance of TDR Loans:
Total average balance of TDR Loans	14,021	8,493	13,864	8,547
Interest income recognized on TDR Loans:
Total interest income recognized on TDR Loans	226	103	402	200
Second lien [Member]
Average balance of TDR Loans:
Total average balance of TDR Loans	1,155	596	1,143	613
Interest income recognized on TDR Loans:
Total interest income recognized on TDR Loans	27	10	48	17
Total real estate secured [Member]
Average balance of TDR Loans:
Total average balance of TDR Loans	15,176	9,089	15,007	9,160
Interest income recognized on TDR Loans:
Total interest income recognized on TDR Loans	253	113	450	217
Personal non-credit card [Member]
Average balance of TDR Loans:
Total average balance of TDR Loans	1,200	632	1,278	653
Interest income recognized on TDR Loans:
Total interest income recognized on TDR Loans	$ 46	$ 12	$ 88	$ 25