Equity Changes in AOCI (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 1,733	$ 1,203
OCI before reclassifications	24	340
Amounts reclassified from OCI	(116)	32
Total other comprehensive (loss) income	(92)	372
Ending balance	1,641	1,575
Available-for-Sale Securities [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	2,121	1,627
OCI before reclassifications	24	340
Amounts reclassified from OCI	(115)	32
Total other comprehensive (loss) income	(91)	372
Ending balance	2,030	1,999
Accumulated Other Comprehensive Income (Loss), Other [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(388)	(424)
OCI before reclassifications	0	0
Amounts reclassified from OCI	(1)	0
Total other comprehensive (loss) income	(1)	0
Ending balance	$ (389)	$ (424)

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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