Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2014
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound	$ 30		$ 30
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound	150		150
Tax Settlement Gain (Loss) Noncash	141	274
Tax Settlement Interest Gain (Loss)	23	21
Estimated Tax Settlement Gain (Loss) Noncash, Range, Lower Limit			90
Estimated Tax Settlement Interest Gain (Loss) Noncash, Range, Lower Limit		$ 220