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Shareholders' Equity (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified |
0 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|---|---|
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Jun. 19, 2013
|
May 31, 2013
item
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Mar. 31, 2012
|
Jun. 30, 2013
subsidiary
|
Jun. 30, 2013
subsidiary
|
Jun. 30, 2012
|
Dec. 31, 2012
|
May 31, 2011
item
|
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| Distribution of qualifying additional paid-in capital | ||||||||
| Proposed U.S. dollar-denominated dividend | $ 816 | |||||||
| Number of quarterly installments (in installments) | 4 | 4 | ||||||
| Cash distribution approved in the form of additional paid-in capital (in dollars per share) | $ 2.24 | $ 3.16 | ||||||
| Amount of installment (in dollars per share) | $ 0.56 | $ 0.79 | ||||||
| Installment of dividend paid | 204 | 278 | 204 | 204 | 278 | |||
| Unpaid distribution payable | $ 612 | $ 612 | ||||||
| Shares held by subsidiary | ||||||||
| Number of subsidiaries to whom shares were issued | 1 | 1 | ||||||
| Number of shares held by subsidiary | 10.6 | 10.6 | 11.5 | |||||