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Equity (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity |  |
Balance as of beginning of period | $ 21,354 | $ 21,244
Net income | 513 | 968
Dividends | (282) | (206)
Stock-based compensation expense | 12 | 9
Tax deduction in excess of stock-based compensation expense | 10 | 15
Transactions in connection with stock-based compensation plans: |  |
Stock issuances | 3 | 15
Contributions from noncontrolling interests | 0 | 2
Distributions to noncontrolling interests | (7) | (5)
Other comprehensive income (loss) | 132 | (363)
Balance as of end of period | 21,495 | 21,342
Stock-Based Compensation Plans Purchase Program [Member] |  |
Transactions in connection with stock-based compensation plans: |  |
Stock purchases | (42) | (50)
Common Stock Purchase Program [Member] |  |
Transactions in connection with stock-based compensation plans: |  |
Stock purchases | (198) | (287)
Parent [Member] |  |
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity |  |
Balance as of beginning of period | 20,527 | 20,677
Net income | 495 | 964
Dividends | (282) | (206)
Stock-based compensation expense | 12 | 9
Tax deduction in excess of stock-based compensation expense | 10 | 15
Transactions in connection with stock-based compensation plans: |  |
Stock issuances | 3 | 15
Contributions from noncontrolling interests | 0 | 0
Distributions to noncontrolling interests | 0 | 0
Other comprehensive income (loss) | 131 | (363)
Balance as of end of period | 20,656 | 20,774
Parent [Member] | Stock-Based Compensation Plans Purchase Program [Member] |  |
Transactions in connection with stock-based compensation plans: |  |
Stock purchases | (42) | (50)
Parent [Member] | Common Stock Purchase Program [Member] |  |
Transactions in connection with stock-based compensation plans: |  |
Stock purchases | (198) | (287)
Noncontrolling Interest [Member] |  |
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity |  |
Balance as of beginning of period | 827 | 567
Net income | 18 | 4
Transactions in connection with stock-based compensation plans: |  |
Contributions from noncontrolling interests | 0 | 2
Distributions to noncontrolling interests | (7) | (5)
Other comprehensive income (loss) | 1 | 0
Balance as of end of period | $ 839 | $ 568

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