CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income		$ 153	$ 40
Available-for-sale securities:
Unrealized gains, net(1)	[1]	94	39
Reclassification into earnings, net(2)	[2]	(9)	(6)
Net change from available-for-sale securities		85	33
Cash flow hedging instruments:
Unrealized losses, net(3)	[3]	0	(11)
Reclassification into earnings, net(4)	[4]	0	16
Net change from cash flow hedging instruments		0	5
Other comprehensive income (loss)		85	38
Comprehensive income		$ 238	$ 78

[1] Amounts are net of provision for income taxes of $58 million and $24 million for the three months ended March 31, 2016 and 2015, respectively.

[2] Amounts are net of provision for income taxes of $6 million and $4 million for the three months ended March 31, 2016 and 2015, respectively.

[3] Amounts are net of benefit from income taxes of $6 million for the three months ended March 31, 2015.

[4] Amounts are net of benefit from income taxes of $10 million for the three months ended March 31, 2015.