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Condensed Financial Information (Parent Company) (Long-term Debt Outstanding) (Details) - Parent Company $ in Millions, ¥ in Billions | Dec. 31, 2022 USD ($) | Mar. 31, 2022 | Dec. 31, 2021 USD ($) | Dec. 16, 2021 JPY (¥) | Jul. 15, 2021 JPY (¥) | Jun. 30, 2021 USD ($)
--- | --- | --- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.23% | 100.00% | 212.00% |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |
Senior Notes | $ | $ 13,588 |  | $ 12,814 |  |  |
Notes Payable, Related Parties | $ | 1,676 |  | 1,884 |  |  |
Long-term Debt | $ | $ 15,264 |  | 14,698 |  |  |
Senior Notes, Unaffiliated [Member] |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |
Weighted Average Interest Rate | 4.42% |  |  |  |  |
Senior Notes | $ | $ 13,588 |  | 12,814 |  |  |
Senior Notes, Affiliated [Member] |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 182.00%
Long-term Debt [Abstract] |  |  |  |  |  |
Weighted Average Interest Rate | 1.98% |  |  |  |  |
Senior Notes | $ |  |  |  |  |  | $ 250
Notes Payable, Related Parties | $ | $ 1,676 |  | $ 1,884 |  |  |
Minimum | Senior Notes, Unaffiliated [Member] |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 0.50% |  |  |  |  |
Minimum | Senior Notes, Affiliated [Member] |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 1.59% |  |  |  |  |
Maximum | Senior Notes, Unaffiliated [Member] |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 6.50% |  |  |  |  |
Maximum | Senior Notes, Affiliated [Member] |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 6.56% |  |  |  |  |
SeniorDebtYen53.7BillionJune2021 | Senior Notes, Affiliated [Member] |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 2.9725% |
Long-term Debt [Abstract] |  |  |  |  |  |
Senior Notes |  |  |  |  | ¥ 53.7 |
SeniorDebtYen13.7BillionJuly2026 | Senior Notes, Affiliated [Member] |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 1.61% |
Long-term Debt [Abstract] |  |  |  |  |  |
Senior Notes |  |  |  |  | ¥ 13.7 |
SeniorDebtYen14.3BillionJuly2028 | Senior Notes, Affiliated [Member] |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 1.755% |
Long-term Debt [Abstract] |  |  |  |  |  |
Senior Notes |  |  |  |  | ¥ 14.3 |
SeninorDebtYen25.7BillionJuly2031 | Senior Notes, Affiliated [Member] |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |
Senior Notes |  |  |  |  | ¥ 25.7 |
SeniorDebtYen25.7BillionJuly2028 | Senior Notes, Affiliated [Member] |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 1.852% |
SeniorDebtYen54.6BillionDecember2021 | Senior Notes, Affiliated [Member] |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.135% |  |
Long-term Debt [Abstract] |  |  |  |  |  |
Senior Notes |  |  |  | ¥ 54.6 |  |
SeniorDebtYen12.2BillionDecember2021 | Senior Notes, Affiliated [Member] |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 1.588% |  |
Long-term Debt [Abstract] |  |  |  |  |  |
Senior Notes |  |  |  | ¥ 12.2 |  |
SeniorDebtYen19.1BillionDecember2021 | Senior Notes, Affiliated [Member] |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 1.7185% |  |
Long-term Debt [Abstract] |  |  |  |  |  |
Senior Notes |  |  |  | ¥ 19.1 |  |
SeniorDebtYen23.3BillionDecember2021 | Senior Notes, Affiliated [Member] |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 1.85% |  |
Long-term Debt [Abstract] |  |  |  |  |  |
Senior Notes |  |  |  | ¥ 23.3 |  |

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