Income Taxes - Rollforward of Gross Consolidated Liability for Unrecognized Income Tax Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning of year	$ 270	$ 197	$ 230
Tax positions related to current year:
Additions	37	25	42
Reductions	0	(1)	(2)
Tax positions related to prior years:
Additions	10	64	14
Reductions	(33)	(4)	(71)
Settlements	(5)	0	(3)
Lapses in statutes of limitations	(13)	(11)	(13)
Unrecognized tax benefits, end of year	$ 266	$ 270	$ 197

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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