Variable Interest Entities and Other Investments (Details 1) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Balances of other investments
Total other investments	$ 1,192	$ 1,188
Renewable energy investments [Member]
Balances of other investments
Total other investments	281	291
Consolidated VIEs [Member]
Balances of other investments
Total other investments	330	285
LIHC investments - unguaranteed [Member]
Balances of other investments
Total other investments	354	353
LIHC investments - guaranteed [Member]
Balances of other investments
Total other investments	187	163
Private capital investments - cost method [Member]
Balances of other investments
Total other investments	9	72
Private capital investments - equity method [Member]
Balances of other investments
Total other investments	$ 31	$ 24