Shareholders' Equity (Accumulated Other Comprehensive Income by Component) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
AOCI net of tax, beginning balance			$ (95)
Other comprehensive income (loss)	(596)	409	(12)	(474)
AOCI net of tax, ending balance	(107)		(107)
Accumulated Other Comprehensive Income (Loss)
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
AOCI net of tax, beginning balance			(95)	360
Other comprehensive income (loss) before reclassifications			(25)	(492)
Amounts reclassified out of AOCI			13	18
Other comprehensive income (loss)			(12)	(474)
AOCI net of tax, ending balance	(107)	(114)	(107)	(114)
Net Unrealized Gains (Losses) on Cash Flow Hedges
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
AOCI net of tax, beginning balance			161	69
Other comprehensive income (loss) before reclassifications			54	59
Amounts reclassified out of AOCI			2	2
Other comprehensive income (loss)			56	61
AOCI net of tax, ending balance	217	130	217	130
Net Unrealized Gains (Losses) on Available-for-Sale Securities
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
AOCI net of tax, beginning balance			(221)	519
Other comprehensive income (loss) before reclassifications			425	(578)
Amounts reclassified out of AOCI			(9)	(3)
Other comprehensive income (loss)			416	(581)
AOCI net of tax, ending balance	195	(62)	195	(62)
Net Unrealized Losses on Hedges of Net Investments in Non-U.S. Subsidiaries
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
AOCI net of tax, beginning balance			(14)	(14)
Other comprehensive income (loss) before reclassifications			0	0
Amounts reclassified out of AOCI			0	0
Other comprehensive income (loss)			0	0
AOCI net of tax, ending balance	(14)	(14)	(14)	(14)
Other-Than-Temporary Impairment on Held-to-Maturity Securities
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
AOCI net of tax, beginning balance			(47)	(65)
Other comprehensive income (loss) before reclassifications			15	11
Amounts reclassified out of AOCI			1	3
Other comprehensive income (loss)			16	14
AOCI net of tax, ending balance	(31)	(51)	(31)	(51)
Net Unrealized Losses on Retirement Plans
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
AOCI net of tax, beginning balance			(203)	(283)
Other comprehensive income (loss) before reclassifications			(1)	(6)
Amounts reclassified out of AOCI			19	15
Other comprehensive income (loss)			18	9
AOCI net of tax, ending balance	(185)	(274)	(185)	(274)
Foreign Currency Translation
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
AOCI net of tax, beginning balance			229	134
Other comprehensive income (loss) before reclassifications			(518)	22
Amounts reclassified out of AOCI			0	1
Other comprehensive income (loss)			(518)	23
AOCI net of tax, ending balance	$ (289)	$ 157	$ (289)	$ 157