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Equity (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jul. 13, 2015 | Jul. 31, 2015 | Jul. 31, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity |  |  |  |  |  |  |
Balance as of beginning of period |  | $ 22,006,000,000 | $ 20,720,000,000 |  |  | $ 21,244,000,000 | $ 19,946,000,000
Net income |  |  |  | $ 1,365,000,000 | $ 593,000,000 | 2,333,000,000 | 1,429,000,000
Dividends |  |  |  |  |  | (409,000,000) | (266,000,000)
Stock-based compensation expense |  |  |  |  |  | 18,000,000 | 21,000,000
Tax deduction in excess of stock-based compensation expense |  |  |  |  |  | 27,000,000 | 31,000,000
Transactions in connection with stock-based compensation plans: |  |  |  |  |  |  |
Stock issuances |  |  |  |  |  | 20,000,000 | 32,000,000
Contributions from noncontrolling interests |  |  |  |  |  | 2,000,000 | 14,000,000
Distributions to noncontrolling interests |  |  |  |  |  | (34,000,000) | (4,000,000)
Other comprehensive income (loss) |  |  |  | 201,000,000 | 149,000,000 | (162,000,000) | 76,000,000
Balance as of end of period |  |  |  | 22,006,000,000 | 20,720,000,000 | 22,006,000,000 | 20,720,000,000
Equity (Textual) |  |  |  |  |  |  |
Stock purchases, in shares |  |  | 2,000,000 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |
Stock purchases, in shares |  | 675,000 |  |  |  |  |
Subsequent Event [Member] | Dividend Declared [Member] |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |
Dividends payable, date declared | Jul. 13, 2015 |  |  |  |  |  |
Dividends payable, amount per share | $ 0.40 |  |  |  |  |  |
Dividends payable, date to be paid | Sep. 02, 2015 |  |  |  |  |  |
Dividends payable, date of record | Aug. 04, 2015 |  |  |  |  |  |
Stock-Based Compensation Plans Repurchase Program [Member] |  |  |  |  |  |  |
Transactions in connection with stock-based compensation plans: |  |  |  |  |  |  |
Stock purchases |  |  |  |  |  | (105,000,000) | (76,000,000)
Equity (Textual) |  |  |  |  |  |  |
Stock purchases |  |  |  |  |  | 105,000,000 | 76,000,000
Common Stock Repurchase Program [Member] |  |  |  |  |  |  |
Transactions in connection with stock-based compensation plans: |  |  |  |  |  |  |
Stock purchases |  |  |  |  |  | (928,000,000) | (483,000,000)
Equity (Textual) |  |  |  |  |  |  |
Stock purchases |  |  |  |  |  | $ 928,000,000 | $ 483,000,000
$2.5 Billion Program Approved July 2015 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |
Authorized amount under stock purchase program | $ 2,500,000,000.0 |  |  |  |  |  |
Treasury Stock [Member] | Stock-Based Compensation Plans Repurchase Program [Member] |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |
Stock purchases, in shares |  |  |  |  |  | 2,000,000 | 1,000,000
Treasury Stock [Member] | Common Stock Repurchase Program [Member] |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |
Stock purchases, in shares |  |  |  |  |  | 15,000,000 | 7,000,000
Parent [Member] |  |  |  |  |  |  |
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity |  |  |  |  |  |  |
Balance as of beginning of period |  | $ 21,453,000,000 | $ 20,211,000,000 |  |  | $ 20,677,000,000 | $ 19,460,000,000
Net income |  |  |  |  |  | 2,315,000,000 | 1,416,000,000
Dividends |  |  |  |  |  | (409,000,000) | (266,000,000)
Stock-based compensation expense |  |  |  |  |  | 18,000,000 | 21,000,000
Tax deduction in excess of stock-based compensation expense |  |  |  |  |  | 27,000,000 | 31,000,000
Transactions in connection with stock-based compensation plans: |  |  |  |  |  |  |
Stock issuances |  |  |  |  |  | 20,000,000 | 32,000,000
Contributions from noncontrolling interests |  |  |  |  |  | 0 | 0
Distributions to noncontrolling interests |  |  |  |  |  | 0 | 0
Other comprehensive income (loss) |  |  |  |  |  | (162,000,000) | 76,000,000
Balance as of end of period |  |  |  | 21,453,000,000 | 20,211,000,000 | 21,453,000,000 | 20,211,000,000
Parent [Member] | Stock-Based Compensation Plans Repurchase Program [Member] |  |  |  |  |  |  |
Transactions in connection with stock-based compensation plans: |  |  |  |  |  |  |
Stock purchases |  |  |  |  |  | (105,000,000) | (76,000,000)
Equity (Textual) |  |  |  |  |  |  |
Stock purchases |  |  |  |  |  | 105,000,000 | 76,000,000
Parent [Member] | Common Stock Repurchase Program [Member] |  |  |  |  |  |  |
Transactions in connection with stock-based compensation plans: |  |  |  |  |  |  |
Stock purchases |  |  |  |  |  | (928,000,000) | (483,000,000)
Equity (Textual) |  |  |  |  |  |  |
Stock purchases |  |  |  |  |  | 928,000,000 | 483,000,000
Noncontrolling Interest [Member] |  |  |  |  |  |  |
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity |  |  |  |  |  |  |
Balance as of beginning of period |  | $ 553,000,000 | $ 509,000,000 |  |  | 567,000,000 | 486,000,000
Net income |  |  |  |  |  | 18,000,000 | 13,000,000
Transactions in connection with stock-based compensation plans: |  |  |  |  |  |  |
Contributions from noncontrolling interests |  |  |  |  |  | 2,000,000 | 14,000,000
Distributions to noncontrolling interests |  |  |  |  |  | (34,000,000) | (4,000,000)
Other comprehensive income (loss) |  |  |  |  |  | 0 | 0
Balance as of end of period |  |  |  | $ 553,000,000 | $ 509,000,000 | $ 553,000,000 | $ 509,000,000

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