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Income Taxes, Reconciliation of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Amount          
Income tax expense at statutory rates     $ 957 $ 862 $ 1,956
U.S. state and Canadian provincial tax expense, net of federal income tax effect     83 36 118
Permanent differences:          
Manufacturing deduction     (42) (22) (102)
Other     (9) (13) (23)
Change in tax law $ (1,900)   (1,862) (7) (17)
Tax effects of income associated with noncontrolling interests     (31) (44) (39)
Other, net     (45) (47) (23)
Income tax expense (benefit)   $ (42) $ (949) $ 765 $ 1,870
Effective Income Tax Rate Reconciliation, Percent          
Income tax expense at statutory rates (percent)     29.80% 27.10% 32.80%
U.S. state and Canadian provincial tax expense, net of federal income tax effect (percent)     2.60% 1.10% 2.00%
Permanent differences:          
Manufacturing deduction (percent)     (1.30%) (0.70%) (1.70%)
Other (percent)     (0.30%) (0.40%) (0.40%)
Change in tax law (percent)     (58.10%) (0.20%) (0.30%)
Tax effects of income associated with noncontrolling interests (percent)     (1.00%) (1.40%) (0.70%)
Other, net (percent)     (1.40%) (1.50%) (0.40%)
Income tax expense (benefit) (percent)     (29.70%) 24.00% 31.30%
U.S. [Member]          
Effective Income Tax Rate Reconciliation, Amount          
Income tax expense at statutory rates     $ 799 $ 606 $ 1,864
U.S. state and Canadian provincial tax expense, net of federal income tax effect     37 5 45
Permanent differences:          
Manufacturing deduction     (42) (22) (102)
Other     (9) (3) (18)
Change in tax law     (1,862) 0 0
Tax effects of income associated with noncontrolling interests     (31) (44) (39)
Other, net     (52) (37) (25)
Income tax expense (benefit)     $ (1,160) $ 505 $ 1,725
Effective Income Tax Rate Reconciliation, Percent          
Income tax expense at statutory rates (percent)     35.00% 35.00% 35.00%
U.S. state and Canadian provincial tax expense, net of federal income tax effect (percent)     1.60% 0.30% 0.80%
Permanent differences:          
Manufacturing deduction (percent)     (1.80%) (1.30%) (1.90%)
Other (percent)     (0.40%) (0.20%) (0.30%)
Change in tax law (percent)     (81.60%) 0.00% 0.00%
Tax effects of income associated with noncontrolling interests (percent)     (1.40%) (2.50%) (0.70%)
Other, net (percent)     (2.30%) (2.10%) (0.50%)
Income tax expense (benefit) (percent)     (50.90%) 29.20% 32.40%
International [Member]          
Effective Income Tax Rate Reconciliation, Amount          
Income tax expense at statutory rates     $ 158 $ 256 $ 92
U.S. state and Canadian provincial tax expense, net of federal income tax effect     46 31 73
Permanent differences:          
Manufacturing deduction     0 0 0
Other     0 (10) (5)
Change in tax law     0 (7) (17)
Tax effects of income associated with noncontrolling interests     0 0 0
Other, net     7 (10) 2
Income tax expense (benefit)     $ 211 $ 260 $ 145
Effective Income Tax Rate Reconciliation, Percent          
Income tax expense at statutory rates (percent)     17.10% 17.70% 14.30%
U.S. state and Canadian provincial tax expense, net of federal income tax effect (percent)     5.00% 2.10% 11.30%
Permanent differences:          
Manufacturing deduction (percent)     (0.00%) (0.00%) (0.00%)
Other (percent)     0.00% (0.70%) (0.80%)
Change in tax law (percent)     0.00% (0.50%) (2.60%)
Tax effects of income associated with noncontrolling interests (percent)     (0.00%) (0.00%) (0.00%)
Other, net (percent)     0.80% (0.70%) 0.30%
Income tax expense (benefit) (percent)     22.90% 17.90% 22.50%