(Millions) | ||||||||||
Marketable securities – auction rate securities only | 2013 | 2012 | 2011 | |||||||
Beginning balance | $ | 7 | $ | 4 | $ | 7 | ||||
Total gains or losses: | ||||||||||
Included in earnings | ― | ― | ― | |||||||
Included in other comprehensive income | 4 | 3 | (3) | |||||||
Purchases, issuances, and settlements | ― | ― | ― | |||||||
Transfers in and/or out of Level 3 | ― | ― | ― | |||||||
Ending balance (December 31) | 11 | 7 | 4 | |||||||
Change in unrealized gains or losses for the period included in | ||||||||||
earnings for securities held at the end of the reporting period | ― | ― | ― |